The document summarizes research on the emerging sociabilities and social behaviors on social network sites. Three key studies are discussed. Study 1 found that social network sites allow for a flexible form of sociability through social multitasking and a reflexive understanding of privacy. Study 2 examined the visual rhetoric of Facebook photo galleries and found they demonstrate awareness of the camera and are used to reinforce close group membership. Study 3 explored how the architecture of social networks balances public and private self-presentation through spaces that are publicly private and privately public. The implications are that online sociabilities are networked, remixed and fluid as boundaries between public and private become more complex.