Web 2.0 is a new concept in internet use that emphasizes user participation, collaboration, and sharing through social media and user-generated content. Some key aspects of Web 2.0 include allowing users to interact and collaborate online as creators of user-generated content and services, rather than only as consumers, and encouraging services that "get smarter" as more people use them. Common Web 2.0 functions include social networking, social bookmarking, video sharing, online chatting, and tools that are useful for librarians.