Web 2.0 refers to new ways that software developers and users utilize the world wide web, enabled by technologies that make it easy to publish and share information online. Key Web 2.0 tools include weblogs (blogs) that allow users to easily create and update websites; wikis that enable collaborative editing of web pages; and social networking, bookmarking, photo sharing, and audio/video publishing tools that facilitate interactive experiences and communities online. While Web 2.0 has expanded multimedia publishing and opportunities for participation, it also brings risks that teachers should consider when deciding how best to incorporate these tools into lessons.