This document discusses social commerce, which is defined as using social networks in the context of e-commerce transactions. It identifies 7 types of social commerce including social network-driven sales, peer-to-peer sales, group buying, peer recommendations, user-curated shopping, participatory commerce, and social shopping. Examples are given like Facebook commerce, Twitter commerce, Groupon, and platforms that allow users to communicate and influence each other's purchasing decisions. The document also mentions examples of companies using social features to boost online conversions and sales.