“I view social interaction design as a field that seeks user-centric descriptions of experiences and behaviors on social media, with an eye on emergent social practices. I see user interactions as occurring between users, mediated by social tools â€” not as interactions with the tools only. Social practices, in the view of social theory, involve users who know what theyâ€™re doing, whatâ€™s going on, and how to participate. Not on the basis of whatâ€™s on the screen, at the level of the interface and its design, but in terms of the social activity in which they are involved. […]
I view social interaction design as a paradigm shift in design thinking for two reasons. First, because descriptions and explanations of user activities focus on user experiences, not on design. Second, because the model involves two or more users interacting with each other, not one user interacting with a software application.”
Adrian Chan has posted what he calls a “big picture introduction” to the theory behind social interaction design.