This document discusses communities, networks, and audiences in social media. It defines social networks as connections between nodes, like friends and followers, and discusses principles of social networks like connectivity and centrality. Communities are described as having shared interests and facilitating interaction. Examples provided include a PKU community website and patient community site. The importance of real-time conversations is discussed. Social media goals may include growing awareness and relationships in the short and long term. Examples provided are a marriage equality campaign and Dove's real beauty campaign. Interactions between social media users are suggested to include listening, talking, supporting, and creating.