This document discusses how libraries in the United States are using social media and Web 2.0 tools to promote services and attract new users. It provides an overview of key terms like social media and Web 2.0 and describes how libraries have embraced these tools, with many focusing on blogs, content management systems, social networks, and instant messaging. While some libraries fear potential security issues, these tools allow libraries to better compete with bookstores and communicate their value. A survey found the majority of libraries using tools like blogs and social networks to promote services.