The following is a list of websites that have a question-and-answer form.
| Website | URL | Founded | Description/Focus | Languages available | Copyrighting of user contributions | Volunteer? | Alexa ranking | Registration needed? |
|---|---|---|---|---|---|---|---|---|
| Allexperts | [1] | 1998 | Yes | 1,957 | No | |||
| AOL Answers | [2] | 2006 | Yes | 6,634 | Yes | |||
| Answerbag | [3] | 2003 | Yes | 1,128 | ||||
| Answers.com | [4] | 2005 | Yes | 127 | No | |||
| Askpedia | [5] | 123,765 | ||||||
| Ask Me Help Desk | [6] | 2003 | Yes | 6,686 | Yes | |||
| Ask MetaFilter | ask.metafilter.com | Many topics | English | |||||
| Askville | [7] | December 8, 2006 | Many topics | English | Yes | Yes | ||
| Baidu 知道 (Baidu Know) | zhidao.baidu.com | Many topics | Chinese | |||||
| bab.la Forum: Ask & Answer | [8] | 2011 | Yes | 2,133 | No | |||
| Blurtit | [9] | 2006 | Yes | 1,716 | ||||
| ChaCha | [10] | 2006 | Many Topics | English | contributions owned by ChaCha[1] | 1,198 | ||
| Experts-Exchange | [11] | 1996 | Yes | 1,424 | Yes | |||
| Flipter | [12] | 2010 | Yes | 501,469 | ||||
| Fluther | [13] | 17,014 | ||||||
| GirlsAskGuys | http://www.girlsaskguys.com | June 2007 | love, sex and relationships | English | Yes | Yes | ||
| Google Questions and Answers | otvety.google.ru (Russian version), wenda.tianya.cn (Chinese version), www.google.com/baraza/ (English and French versions) | Many topics | Russian, Chinese, English, French | |||||
| Hesitation | [14] | 2011 | Yes | Yes | ||||
| iAsk | iask.sina.com.cn | Many topics | Chinese | |||||
| LinkedIn Answers | [15] | January 4, 2007 | ||||||
| otvet.mail.ru | otvet.mail.ru | Many topics | Russian | |||||
| MathOverflow | mathoverflow.net | September 28, 2009 | Graduate-level and research-level mathematics | English | ||||
| mshd.net | [16] | 2010 | No | 4,340,018 | No | |||
| Quora | [17] | 2009 | Many topics | English | contributions owned by it's author (i.e. the user), who grants Quora some rights including the use, distribution or modification of the content he/she created[2] | 1,042 | Yes | |
| Rediff Q&A | [18] | No | ||||||
| SN50 Answers | [19] | 2010 | Many topics | English | Yes | 855,363 | ||
| SocialAnswers | [20] | 2011 | Yes | |||||
| Stack Exchange Network | [21] | 2008 | Network of Question and Answer websites, Many topics | English | CC BY-SA 2.5 | Yes | 1,576 | No |
| Vark | [22] | 2007 | ||||||
| W5HAnswers | [23] | 3,870,819 | ||||||
| WebAnswers | [24] | 9,465 | ||||||
| Whyzz | [25] | 553,985 | ||||||
| WikiAnswers | [26] | |||||||
| Wikipedia Reference Desk | Wikipedia:Reference desk | c. 2004 | Any topic including Computers and IT; Entertainment; Humanities; Language; Mathematics and Science | English | Yes | No | ||
| Yahoo! Answers | http://answers.yahoo.com/ | July 5, 2005 | Many topics | Chinese, English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Spanish, Thai, Vietnamese | contributions owned by it's author (i.e. the user), who grants Yahoo some rights including the use, distribution or modification of the content he/she created[3] | Yes | Yes |