This document discusses the role of social media in national library services. It defines social media and outlines how improvements in technology, the rise of new devices, and changes in human behavior have led to the growth of social media. The document then categorizes different types of social media and provides data on internet and technology penetration in the US. It offers suggestions on how libraries can begin using social media and lists benefits such as communicating with users, marketing services, understanding user needs better, and providing services in a more economical way.