This document provides an overview of social media. It defines social media as interactive and user-generated content that is accessible and immediate. It then discusses key questions about understanding one's audience and goals. Statistics are presented on the popularity and demographics of social networking sites like Facebook and LinkedIn, as well as the microblogging platform Twitter and geosocial services. The document concludes with tips on engaging audiences through creating inviting content, interacting with others, posting regularly, and tracking results.