List of Facebook features

Facebook is a social network service website launched on February 4, 2004. This is a list of software and technology features that can be the Facebook website and are available to users of the social media site.

Facebook structure

News Feed

The news feed is the primary system through which users are exposed to content posted on the network. Using a secret method (initially known as EdgeRank), Facebook selects a handful updates to actually show users every time they visit their feed, out of an average of 1500 updates they can potentially receive.[1][2]

On September 6, 2006, Ruchi Sanghvi announced a new home page feature called News Feed. Originally, when users logged into Facebook, they were presented with a customizable version of their own profile. The new layout, by contrast, created an alternative home page in which users saw a constantly updated list of their friends' Facebook activity. News Feed highlights information that includes profile changes, upcoming events, and birthdays, among other updates. This has enabled spammers and other users to manipulate these features by creating illegitimate events or posting fake birthdays to attract attention to their profile or cause. News Feed also shows conversations taking place between the walls of a user's friends. An integral part of the News Feed interface is the Mini Feed, a news stream on the user's profile page that shows updates about that user. Unlike in the News Feed, the user can delete events from the Mini Feed after they appear so that they are no longer visible to profile visitors. In 2011 Facebook updated the News Feed to show top stories and most recent stories in one feed, and the option to highlight stories to make them top stories, as well as to un-highlight stories. In response to users' criticism, Facebook later updated the News Feed to allow users to view recent stories first.

Initially, the addition of the News Feed caused some discontent among Facebook users. Many users complained that the News Feed was too cluttered with excess information. Others were concerned that the News Feed made it too easy for other people to track activities like changes in relationship status, events, and conversations with other users. This tracking is often casually referred to as "Facebook-Stalking". In response to this dissatisfaction, creator Mark Zuckerberg issued an apology for the site's failure to include appropriate customizable privacy features. Thereafter, users were able to control what types of information were shared automatically with friends. Currently, users may prevent friends from seeing updates about several types of especially private activities, although other events are not customizable in this way.

With the introduction of the "New Facebook" in early February 2010 came a complete redesign of the pages, several new features and changes to News Feeds. On their personal Feeds (now integrated with Walls), users were given the option of removing updates from any application as well as choosing the size they show up on the page. Furthermore, the community feed (containing recent actions by the user's friends) contained options to instantly select whether to hear more or less about certain friends or applications.

On March 7, 2013, Facebook has announced a redesigned newsfeed.

Friends

"Friending" someone is the act of sending another user a friend request on Facebook. The two people are Facebook friends once the receiving party accepts the friend request. In addition to accepting the request, the user has the option of declining the friend request or hiding it using the "Not Now" feature. Deleting a friend request removes the request, but does allow the sender to resend it in the future. The "Not Now" feature hides the request but does not delete it, allowing the receiver to revisit the request at a later date.

It is also possible to remove a user from one's friends, which is referred to as "unfriending" by Facebook.[3] Many Facebook users also refer to the process as "de-friending".[4] "Unfriend" was New Oxford American Dictionary's word of the year in 2009.[5][6] Facebook does not notify a user if they have been unfriended, but there are scripts[7] that provide this functionality. There has also been a study on why Facebook users unfriend, which found that differences, especially between ages, and few mutual friendships were the dominant factors correlated with unfriending, all of which mirrors the decline of physical-world relationships.[8]

Facebook profiles also have advanced privacy features to restrict content to certain users, such as non-friends or persons on a specific list.

Wall

The Wall is the original profile space where Facebook users' content until December 2011 was displayed. It allowed the posting of messages, often short or temporal notes, for the user to see while displaying the time and date the message was written. A user's Wall is visible to anyone with the ability to see his or her full profile, and friends' Wall posts appear in the user's News Feed.

In July 2007, Facebook allowed users to post attachments to the Wall, whereas previously the Wall was limited to text only.[9] In May 2008, the Wall-to-Wall for each profile was limited to only 40 posts. Facebook later allowed users to insert HTML code in boxes attached to the wall via apps like Static FBML which has allowed marketers to track use of their fan pages with Google Analytics.

The concept of tagging in status updates, an attempt to imitate Twitter,[10] began September 14, 2009. This meant putting the name of a user, a brand, an event or a group[11] in a post in such a way that it linked to the wall of the Facebook page being tagged, and made the post appear in news feeds for that page, as well as those of selected friends.[12] This was first done using the "@" symbol followed by the person's name. Later, a numerical ID for the person could be used.[13] Early in 2011, tagging in comments was added.

In addition to postings by other users, the Wall also displayed other events that happened to the user's profile. This included when information was changed, when they changed their profile picture, and when they connected with new people, among other things.

The Wall has been replaced by the Timeline profile layout, which was introduced in December 2011.

Timeline

Since December 15, 2011, a Timeline is the new virtual space in which all the content of Facebook users is organized and shown.[14] Replacing the Wall, in a Timeline the photos, videos, and posts of any given user are categorized according to the period of time in which they were uploaded or created.[14] Posts and events are displayed along a timeline that runs through the center of the profile, with the option of adding events that occurred prior to the user joining Facebook as well as "hiding" posts.[15] Some experts saw this as a crucial step on the use of social networks.[16] In March 2012, Timeline became available for "Facebook Pages", and by the end of the month, Facebook had forced all Facebook Pages (not Profile pages) to convert to the Timeline layout, against the will of many page admins. Like the Wall, users can set Timeline privacy settings to change who can see their entire profile. Users' friends have the ability to post messages on the user's Timeline. Using Facebook on certain devices, such as iPads, may result in automatic adoption of the Timeline. In August 2012, Profile pages were forced to change to the Timeline layout.

Likes and Reactions

The "like" button on Facebook.

The like button, first enabled on February 9, 2009,[17] enables users to easily interact with status updates, comments, photos, links shared by friends, and advertisements. Once clicked by a user, the designated content appears in the News Feeds of that user's friends,[18][19] and the button also displays the number of other users who have liked the content, including a full or partial list of those users.[20] The like button was extended to comments in June 2010.[21] After extensive testing[22] and years of questions from the public about whether it had an intention to incorporate a "Dislike" button,[23] Facebook officially rolled out "Reactions" to users worldwide on February 24, 2016, letting users long-press on the like button for an option to use one of five pre-defined emotions, including "Love", "Haha", "Wow", "Sad", or "Angry".[22][24] Reactions were also extended to comments in May 2017.[25][26]

Comments

To mark the 30th anniversary of the GIF, Facebook has introduced a new feature enabling users to add GIFs to comments. The eagerly-awaited feature can be accessed using the GIF button located beside the emoji picker. Users can choose from the available GIFs sourced from Facebook's GIF partners, but cannot upload other GIFs.

Messages and inbox

Facebook Messenger is an instant messaging service and software application. Originally developed as Facebook Chat in 2008,[27] the company revamped its messaging service in 2010,[28] and subsequently released standalone iOS and Android apps in August 2011.[29] Over the years, Facebook has released new apps on a variety of different operating systems,[30][31][32] launched a dedicated website interface,[33] and separated the messaging functionality from the main Facebook app, requiring users to download the standalone apps.[34]

Facebook Messenger lets Facebook users send messages to each other. Complementing regular conversations, Messenger lets users make voice calls[35] and video calls[36] both in one-to-one interactions[37] and in group conversations.[38] Its Android app has integrated support for SMS[39] and "Chat Heads", which are round profile photo icons appearing on-screen regardless of what app is open,[40] while both apps support multiple accounts,[41] conversations with optional end-to-end encryption,[42] and playing "Instant Games", which are select games built into Messenger.[43] Some features, including sending money[44] and requesting transportation,[45] are limited to the United States.[44] In 2017, Facebook has added "Messenger Day", a feature that lets users share photos and videos in a story-format with all their friends with the content disappearing after 24 hours;[46] Reactions, which lets users tap and hold a message to add a reaction through an emoji;[47] and Mentions, which lets users in group conversations type @ to give a particular user a notification.[47]

In March 2015, Facebook announced that it would start letting businesses and users interact through Messenger with features such as tracking purchases and receiving notifications, and interacting with customer service representatives. It also announced that third-party developers could integrate their apps into Messenger, letting users enter an app while inside Messenger and optionally share details from the app into a chat.[48] In April 2016, it introduced an API for developers to build chatbots into Messenger, for uses such as news publishers building bots to give users news through the service,[49] and in April 2017, it enabled the M virtual assistant for users in the U.S., which scans chats for keywords and suggests relevant actions, such as its payments system for users mentioning money.[50][51] Additionally, Facebook expanded the use of bots, incorporating group chatbots into Messenger as "Chat Extensions", adding a "Discovery" tab for finding bots, and enabling special, branded QR codes that, when scanned, take the user to a specific bot.[52]

Notifications

Notifications tell the user that something has been added to his or her profile page. Examples include: a message being shared on the user's wall or a comment on a picture of the user or on a picture that the user has previously commented on. Initially, notifications for events were limited to one per event; these were eventually grouped category wise. For instance, 10 users having liked a user's picture now count for one notification, whereas in the earlier stages, these would have accounted for ten separate notifications. The number of notifications can be changed in the settings section, to a maximum of 99. There is a red notification counter at the top of the page, which if clicked displays the most recent ones.

Groups

Facebook Groups can be created by individual users. Groups allow members to post content such as links, media, questions, events, editable documents, and comments on these items.

Groups are used for collaboration and allow discussions, events, and numerous other activities. They are a way of enabling a number of people to come together online to share information and discuss specific subjects. They are increasingly used by clubs, companies and public sector organizations to engage with stakeholders, be they members of the public, employees, members, service users, shareholders or customers. Groups can have three different levels of privacy settings:

Previously, in October 2010, there were version 0 (legacy) and version 1 (current) groups.[54] Version 1 or "new" groups can contain the name of the group in their URL if the email-address of the group is set. Groups do not have a RSS feed to export the wall or the member list, such as Pages or Events have, but third parties provide such service if the group is set to an "open" privacy setting. All groups have since been migrated to a single design.[55]

Applications

Events

Facebook events are a way for members to let friends know about upcoming events in their community and to organize social gatherings. Events require an event name, network, host name, event type, start time, location, and a guest list of friends invited. Events can be public or private. Private events cannot be found in searches and are by invitation only. People who have not been invited cannot view a Private event's description, Wall, or photos. They also will not see any Feed stories about the event. When setting up an event the user can choose to allow friends to upload photos or videos. Note that unlike real world events, all events are treated as separate entities (when the reality is some events sit inside other events, going to one event would preclude going to another, and so on).

In February 2011, Facebook began to use the hCalendar microformat to mark up events, and the hCard microformat for the events' venues, enabling the extraction of details to users' own calendar or mapping applications. Third parties facilitate events to be exported from Facebook Pages to the iCalendar-format.[56]

Marketplace

In 2007, Facebook introduced the Facebook Marketplace, allowing users to post classified ads within sale, housing, and jobs categories.[57] However, the feature never gained traction, and in 2009, control was transferred to Oodle, the platform powering the functionality. The feature was then eventually shut down in 2014.[57] In October 2016, Facebook announced a new Marketplace, citing the growth of organized "buy and sell" Facebook Groups, and gave the new version a higher prominence in the main Facebook app, taking the navigation position previously held by Facebook Messenger.[57][58]

Notes

Facebook Notes was introduced on August 22, 2006, as a blogging platform offering users the ability to write notes, attach photos, and optionally import blog entries from external sources.[59]

The most known usage form of the Notes feature was the Internet meme "25 Random Things About Me", which involves writing 25 things about the user that their friends do not already know about them and using the tag function to ask 25 friends to do the same. The trend became popular in February 2009, with The New York Times discussing its sudden surge, noting that nearly five million notes were created for the purpose, a doubling of the feature's use in the previous week and larger than any other week in Facebook's history.[60]

In September 2015, the Notes feature received an update, bringing additional features, such as adding a cover photo and caption, the ability to resize photos, and text formatting options.[61]

Places

Facebook announced Places on August 18, 2010. It is a feature that lets users check into Facebook using a mobile device to let a user's friends know where they are at the moment.[62]

In November 2010, Facebook announced "Deals", a subset of the Places offering, which allows for users to check in from restaurants, supermarkets, bars, and coffee shops using an app on a mobile device and then be rewarded discounts, coupons, and free merchandise. This feature is marketed as a digital version of a loyalty card or coupon where a customer gets rewarded for loyal buying behavior.[63]

On October 10, 2010, Places became available on BlackBerry,[64] iPhone, and Android. Other users, including Windows Mobile users, must use an HTML5 browser to use Places via Facebook Touch Site.[65]

Facebook Places was reported discontinued on August 24, 2011,[66] but was relaunched in November 2014, now including cover images, discovery sections, city/category landing pages, a deeper integration with the Location API, Graph Search queries and user generated content.[67]

Platform

The Facebook Platform provides a set of APIs and tools which enable third-party developers to integrate with the "open graph", whether through applications on Facebook.com or external websites and devices. Launched on May 24, 2007, Facebook Platform has evolved from enabling development just on Facebook.com to one also supporting integration across the web and devices.

Facebook Platform Statistics as of May 2010:

Third party companies such as Adonomics, Kontagent, and Mixpanel provide application metrics, and blogs such as AppRate, Inside Facebook, and Face Reviews have sprung up in response to the clamor for Facebook applications. On July 4, 2007, Altura Ventures announced the "Altura 1 Facebook Investment Fund", becoming the world's first Facebook-only venture capital firm.

On August 29, 2007, Facebook changed the way in which the popularity of applications is measured, to give attention to the more engaging applications, following criticism that ranking applications only by the number of people who had installed the application was giving an advantage to the highly viral, yet useless applications. Tech blog Valleywag has criticized Facebook Applications, labeling them a "cornucopia of uselessness". Others have called for limiting third-party applications so the Facebook "user experience" is not degraded.

Primarily attempting to create viral applications is a method that has certainly been employed by numerous Facebook application developers. Stanford University even offered a class in the Fall of 2007, entitled, Computer Science (CS) 377W: "Create Engaging Web Applications Using Metrics and Learning on Facebook". Numerous applications created by the class were highly successful, and ranked amongst the top Facebook applications, with some achieving over 3.5 million users in a month.

Facebook Questions

In May 2010, Facebook began testing Questions, which is expected to compete with services such as Yahoo! Answers.[68]

On March 24, 2011, Facebook announced that its new product, Facebook Questions, facilitates short, poll-like answers in addition to long-form responses, and also links directly to relevant items in Facebook's directory of "fan pages".[69]

Photos

Facebook allows users to upload photos, and to add them to albums. In December 2010, the company enabled facial recognition technology, helping users identify people to tag in uploaded photos.[70] In May 2011, Facebook launched a feature to tag specific Facebook Pages in photos, including brands, products, and companies.[71] On mobile, Facebook introduced photo filters in August 2011.[72]

In May 2016, Facebook started allowing users to upload and view 360-degree photos. Mobile users will move their device around to navigate the environment, while website users will have to click and drag.[73][74]

According to Facebook in 2010, there were over 50 billion photos stored on the service.[75]

Videos

In May 2007, Facebook officially launched its video platform, allowing users to upload recorded videos or livestream videos from their webcams. The service supports the ability to "tag" friends in similar ways to photos.[76] In December 2014, Facebook began rolling out functionality for business Pages to pin ("Feature") a video to the top of their Videos tab.[77]

In January 2015, Facebook published a report detailing a significant growth in video viewing on the platform, specifically highlighting the fact that Facebook has seen an average of one billion video views every day since June 2014.[78]

In September 2015, Facebook announced that it would begin showing view counts for publicly posted videos.[79] A few weeks later, the company announced that users will be able to view 360-degree videos. On the website, users can click around to change the perspective, whereas mobile users can physically move their device to interact with the virtual space. The result is the work of a collaboration between Facebook and its Oculus division.[80][81][82]

Live streaming

In August 2015, Facebook launched the ability for verified public figures to broadcast live video streams using the exclusive Facebook Mentions app. Streams appear on the News Feed, and users can comment on them in real-time. Live broadcasts are automatically saved as a video post to the streamer's page. The feature was positioned as a competitor to services such as Meerkat and Periscope.[83][84] The ability to live-stream began to roll out for public use in January 2016, beginning with the Facebook iOS app in the United States.[85][86]

In April 2016, Facebook unveiled a live-streaming application programming interface (API), aimed to allow developers to use any device, including professional video cameras and drones, to integrate with the live-video streaming platform.[87][88] Facebook also updated its mobile app to provide a dedicated section for showcasing current and recent live broadcasts.[89] To drive its adoption, Facebook provided incentives to publishers and celebrities to perform live broadcasts, including monetary rewards.[90][91]

In March 2017, Facebook extended live-streaming support to PCs, both laptops and desktops.[92][93] In June 2017, Facebook added support for closed captioning in Live videos for users who are deaf or hard-of-hearing. However, closed captioning is limited to the CEA-608 standard, a notable difference from the automatic closed captioning available for Page videos that are recorded and then uploaded, due to difficulties in adapting the same standard at scale on the low-latency real-time nature for live content.[94][95]

Facebook Paper

During the same week as its tenth anniversary, Facebook launched the Paper iPhone app. The app consists of two major features: Firstly, Facebook’s News Feed is more graphic, as the app uses technology such as full-screen photos and video footage. Content is organized under headings such as “Creators” and “Planet”; secondly, Paper allows users to post statuses, photos, and “stories” to Facebook that has been described as a different, more presentation-focused design.[96]

Facebook Mentions

Facebook Mentions, initially an iOS-only app, was released by the company in 2014. It allows public figures with a verified account to engage with their respective fanbases in a more concentrated experience.[97][98] The app had been in testing with select celebrities for nearly a year before its launch.[99] In September 2015, Facebook expanded the availability of the Mentions app to journalists and other verified pages, and also gave users of the app the ability to post exclusively to their Facebook followers rather than both followers and friends. The update also enabled the first livestreaming functionality through Facebook Live.[100] Facebook Mentions became available on Android in January 2016.[101][102] In December 2016, Facebook Live on Mentions received several updates, including comment moderation tools, broadcasting appearance customization, and editing features to remove unnecessary footage at the beginning or end of a broadcast.[103][104][105]

General features

Facebook dynamic text/type

In November 2015 Facebook made changes to their text-only status update on Timeline to allow for adjustable text sizes (dynamic text) on mobile apps.[106]

Credits

Facebook Credits are a virtual currency users can use to buy gifts, and virtual goods in many games and applications on the Facebook platform. As of July 2010, users of Facebook can purchase Facebook credits in Australian Dollars, British Pounds, Canadian Dollars, Chilean peso, Colombian peso, Danish krone, Euro, Hong Kong dollar, Japanese yen, Norwegian krone, Swedish krona, Swiss franc, Turkish lira, US Dollars, and Venezuelan Bolivar. Facebook credits can be used on many popular games such as Happy Aquarium, Happy Island, Zoo Paradise, Happy Pets, Hello City, It Girl, FarmVille, and Mafia Wars.[107]

Feature phones

Although like all other website apps Facebook made its presence on the smartphones as mentioned but also is present for the feature phones. As the company said that the feature phones dominate the American cell phone markets hence an app was exclusively made for this purpose as well.[108]

Released in July 2013, Graph Search allows users to search within their network of friends for answers to natural language questions such as, "Movies my friends who like The Hobbit liked" and receive direct answers, rather than the list of websites that search engines usually provide.[109][110]

IPv6

According to a June 2010 report by Network World, Facebook said that it was offering "experimental, non-production" support for IPv6, the long-anticipated upgrade to the Internet's main communications protocol. The news about Facebook's IPv6 support was expected; Facebook told Network World in February 2010, that it planned to support native IPv6 user requests "by the midpoint of this year".[111]

In a presentation at the Google IPv6 Implementors Conference, Facebook's network engineers said it was "easy to make [the] site available on v6". Facebook said it deployed dual-stack IPv4 and IPv6 support on its routers, and that it made no changes to its hosts in order to support IPv6. Facebook also said it was supporting an emerging encapsulation mechanism known as Locator/Identifier Separation Protocol (LISP), which separates Internet addresses from endpoint identifiers to improve the scalability of IPv6 deployments. "Facebook was the first major Web site on LISP (v4 and v6)", Facebook engineers said during their presentation. Facebook said that using LISP allowed them to deploy IPv6 services quickly with no extra cost. Facebook's IPv6 services are available at www.v6.facebook.com m.v6.facebook.com, www.lisp6.facebook.com and m.lisp6.facebook.com.[111] In addition, Facebook enabled IPv6 on its main domain names during World IPv6 Launch.

Listen with Friends

Listen with Friends allows Facebook users to listen to music and discuss the tunes using Facebook Chat with friends at the same time. Users can also listen in as a group while one friend acts as a DJ. Up to 50 friends can listen to the same song at the same time, and chat about it. Every time a user begins listening to music with a friend, a "story will be posted to her/his friends" ticker and/or news feed. Users will have control over who will be able to see when they are listening with a friend through their App Settings page after installing the compatible music app.[112] This feature was initially supported through Audizer.com, but as of August 2012, services were discontinued and the Facebook / Audizer splash page has been redirected to Facebook.com.[113]

Mood faces

Facebook chat supports numerous emoticons, like (^^^) for a shark. Recently, it has also become possible to post larger, animated images through Facebook's built in emotion system.

Phone

At an event in April 2013, Mark Zuckerberg announced a new Android-based "Home" feature, which would show content from users' Facebook pages on the home page of their mobile phones, without having to open an app.[115]

Poke

The poke feature is intended to be a poke gesture (similar to "nudge" in instant messaging) to attract the attention of another user.[116] A previous version of Facebook's FAQ gave additional insight into the origin of the feature, stating:

When we created the poke, we thought it would be cool to have a feature without any specific purpose. People interpret the poke in many different ways, and we encourage you to come up with your own meanings.
— Mark Zuckerberg during a live Facebook webinar

There are several applications on Facebook which extend the idea of the poke feature by allowing users to perform other actions to their friends—such as "kick" or "wave to".

Smartphone integration

Many smartphones offer access to the Facebook services either through their web browsers or applications. The Facebook iPhone-compatible web site was launched August 2007 and as of July 2008 over 1.5 million people used it regularly, at the point when a free application for the iOS named "Facebook for iPhone" was launched.[117] Version 2.0 of this app was released in September 2008 and featured improved services such as being able to respond to friend requests and notifications.[118] Version 3.0 was released in August 2009 and added features such as events, and uploading video with an iPhone 3GS.[119][120]

Microsoft developed an application for Facebook on their Windows Phone 7 platform, available in the Windows Phone Marketplace. Users can pin elements such as Messages, Events, the News Feed, and Photos directly onto one's homescreen. It also includes tile notifications for events, friend requests, tags, and so on.[121] Windows Mobile platform, including features such as messaging, uploading pictures and video straight from the device, managing profile information, contact integration allowing users to call anyone in their friends list that has their number in their profile information. It is also possible to add a chat feature to Windows Mobile via third-party software such as FIM, available in the Windows Mobile Marketplace. Nokia also offers a Facebook app on its Ovi Store for Nokia S60 devices such as the N97, with most of the functionality of the full website.[122]

Google's Android 2.0 OS automatically includes an official Facebook app. The first device to use this is the Motorola Droid. The app has options to sync Facebook friends with contacts, which adds profile pictures and status updates to the contacts list. Research In Motion also offers a Facebook application for the BlackBerry. Functions include an ability to integrate Facebook events into the BlackBerry calendar, and using Facebook profile pictures for Caller ID.[123]

Status updates

"Status updates" (also called as a "status") allows users to post messages for their friends to read. In turn, friends can respond with their own comments, as well as clicking the "Like" button. A user's most recent updates appear at the top of their Timeline/Wall and are also noted in the "Recently Updated" section of a user's friend list. Originally, the purpose of the feature was to allow users to inform their friends of their current "status", including feelings, whereabouts, or actions, where Facebook prompted the status update with "Username is"... and users filled in the rest. This feature first became available in September 2006, though on December 13, 2007, the requirement to start a status update with is was removed.[124]

The is updates were followed by the "What are you doing right now?" status update question; in March 2009, the question was changed to "What's on your mind?"[125] In 2009, Facebook added the feature to tag certain friends (or groups, etc.) within one's status update by adding an @ character before their name, turning the friend's name into a link to their profile and including the message on the friend's wall. Tagging has since been updated to recognize friends' names by typing them into a status while a list of friends whose names match the inputted letters appears. A large percentage of the updates that are posted are humorous and as a result, many apps, websites and books have sprung up to help users to update their own.

Subscribe

In September 2011, Facebook launched a "Subscribe" button, allowing users to follow public updates from people without requiring a Facebook friendship connection.[126][127] The feature was expanded to Pages in July 2012,[128] and to stories in the News Feed in August 2012.[129]

Ticker

In 2011, Facebook launched a ticker that showed all of their friends and pages updates. For example, it shows when their friends comment or like a status, and their status updates as soon as they posted them. If users do not have the chat sidebar open, the ticker appears on Facebook home next to the News Feed. If users do have the chat sidebar open, the ticker appears above the list of friends, and can be re-sized (unless the chat sidebar is open). The ticker cannot be closed, and this has brought up concern among users, especially privacy concerns. However, Facebook has been keen to emphasize that the ticker only shows what people could see before—it just makes it "more discoverable".[130]

URL shortener

Starting June 2009, Facebook lets users choose a username specifically for their profile, enabling them to share links bearing their own www.facebook.com/username URL address.[131] There are limitations, however, to what usernames can be used, including only alphanumerical characters (A-Z, 0-9), a length of over five characters, only one username that is unique to the profile, and must adhere to Facebook's Statement of Rights and Responsibilities agreement.[132] The following December, Facebook launched its own URL shortener based on the FB.me domain name.[133][134]

Verified accounts

TechCrunch reported in February 2012 that Facebook would introduce a "Verified Account" concept, denoting official pages for public figures. Such pages gain more prominence in the "People To Subscribe To" suggestions lists. Persons with established stage names, such as Stefani Germanotta known as Lady Gaga, can also choose to use their specific stage name for their profile, with the real name in the profile's "About" page. However, at the time, the feature did not show any visual signs of distinction from other pages.[135][136] In May 2013, the concept was updated to include a blue checkmark badge to highlight the account's Verified status.[137][138]

Hash-tagging support

In June 2013, Facebook introduced its support for clickable hashtags to help users search for topics being actively discussed on the social network.[139][140]

Impressum

In March 2014, some page administrators in Italy started being prompted to add an impressum to their Facebook page, described as "a legally mandated statement of the ownership and authorship of a document".[141]

Tor hidden service

In October 2014, Facebook announced that users could connect to the website through a Tor hidden service using the privacy-protecting Tor browser and encrypted using SSL.[142][143] Announcing the feature, Facebook engineer Alec Muffett said that "Facebook's onion address provides a way to access Facebook through Tor without losing the cryptographic protections provided by the Tor cloud. [...] It provides end-to-end communication, from your browser directly into a Facebook datacenter."[142][143]

"Say Thanks"

In November 2014, Facebook introduced "Say Thanks", an experience that lets user create personalized video greeting cards for friends on Facebook.[144]

Call-to-Action button

In December 2014, Facebook announced that Pages run by businesses can display a so-called "call-to-action button" next to the page's like button. "Call to action" is a customizable button that lets page administrators add external links for easy visitor access to the business' primary objective, with options ranging from "Book Now", "Contact Us", "Use App", "Play Game", "Shop Now", "Sign Up", and "Watch Video".[145] Initially only rolled out in the United States, the feature was expanded internationally in February 2015.[146]

Security

On May 12, 2011, Facebook announced that it is launching several new security features[147] designed to protect users from malware and from getting their accounts hijacked.[148]

Facebook will display warnings when users are about to be duped by clickjacking and cross-site scripting attacks in which they think they are following a link to an interesting news story or taking action to see a video and instead end up spamming their friends.[148]

Facebook also offers two-factor authentication called "login approvals", which, if turned on, will require users to enter a code whenever they log into the site from a new or unrecognized device. The code is sent via text message to the user's mobile phone.[148]

Facebook is partnering with the free Web of Trust safe surfing service to give Facebook users more information about the sites they are linking to from the social network. When a user clicks on a potentially malicious link, a warning box will appear that gives more information about why the site might be dangerous. The user can either ignore the warning or go back to the previous page.[148]

Removed features

Email

In February 2010, TechCrunch reported that Facebook was working to rewrite its messaging service to turn it into a "fully featured webmail product", dubbed "Project Titan".[149] The feature, unofficially dubbed a "Gmail killer" internally, was launched on November 15, 2010,[150] and allows users to directly communicate with each other via Facebook using several different methods. Users can create their own "username@facebook.com" email address to communicate, use text messaging, or through the Facebook website or mobile app's instant messaging chat. All messages are contained within single threads in a unified inbox.[151] The email service was terminated in February 2014 because of low uptake.[152][153]

FBML

Facebook Markup Language (FBML) was considered to be Facebook's own version of HTML. While many of the tags of HTML can be used in FBML, there were also important tags that cannot be used such as HTML, HEAD, and BODY. Also, JavaScript cannot be used with FBML.

According to the Facebook Markup Language (FBML) Developer's page, FBML is now deprecated. No new features will be added to FBML and developers are recommended to develop new applications utilizing HTML, JavaScript and CSS. FBML support ended January 1, 2012, and FBML was no longer functioning as of June 1, 2012.

Lite

In August 2009, Facebook announced the rollout of a "lite" version of the site, optimized for users on slower or intermittent Internet connections. Facebook Lite offered fewer services, excluded most third-party applications and required less bandwidth.[154] A beta version of the slimmed-down interface was released first to invited testers[155] before a broader rollout across users in the United States, Canada, and India.[154] It was announced on April 20, 2010, that support for the "lite" service had ended and that users would be redirected back to the normal, full content, Facebook website. The service was operational for only eight months.

In June 2015, this feature was reintroduced as an app with a total size of less than 1MB, primarily focusing markets where internet access is slow or limited.[156]

Deals

On April 25, 2011, Facebook announced a pilot program called Deals, which offered online coupons and discounts from local businesses. Facebook initially released Deals as a test in five cities—Atlanta, Austin, Dallas, San Diego, and San Francisco—with the hope of expanding. This new offering was a direct competitor to other social commerce sites such as LivingSocial and Groupon for online coupons and deals-of-the-day. Facebook users were able to use Facebook Credits to purchase vouchers that can be redeemed for real goods and services.[157][158] Facebook has since closed its deal program.

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