"Social architecture" is the conscious design of an environment that encourages a desired range of social behaviors leading towards some goal or set of goals. The environment social architecture influences may be social systems, or digital spaces such as media tools (sometimes synonymous with Web 2.0) and UX strategy.
In social systems, "social architects" seek to modify human behaviors (behavior change) through carefully designed programs or workshops that seek to involve the members of a population to improve, for example, the livability and safety or environmental impact of their own communities.
In digital spaces, there is little distinction between "social architecture" and "information architecture" or "interaction design".