This document discusses Web 2.0 and its implications for libraries. It begins by defining Web 2.0 as the next generation of the internet that allows for two-way communication rather than just static websites. Examples of Web 2.0 tools include social networking sites, photo sharing, wikis, and podcasts. For libraries, Web 2.0 allows for more interactive collections and services focused on information sharing rather than just access. Challenges include resistance to change, funding, and copyright issues. A social media policy is recommended to guide appropriate use of these new technologies.