The document provides an overview of various social media platforms and how they can be used in academic libraries. It defines social networking and lists common features such as user profiles, friending, groups, messaging, and privacy controls. Specific platforms summarized include Facebook, LiveJournal, MySpace, YouTube, Twitter, SlideShare, Google Docs, Flickr, Skype, Pinterest, Scoop it, Prezi, and QR codes. Examples are given for how libraries have used some of these tools for outreach, marketing resources, and engaging users. References are provided at the end.