This document discusses the importance and use of social media in libraries. It defines social media as web-based services that allow users to generate and share content. The document notes that 51% of Americans use Facebook and social media is especially important for reaching younger demographics. It provides examples of how libraries use social media for outreach, community involvement, networking, and digital reference. Challenges and best practices for social media use are also discussed, including having a social media policy and plan in place before implementation.