For both internet gurus and online novices, this handy mini-encyclopedia explores the useful and interesting sites--big and small, popular and obscure--that make up Web 2.0, the new online community. From YouTube and Flickr to eBay and Facebook, each website and online application is explained through step-by-step screen shots and examines what each site does, why people use it, how to get started, and any special features. Simple yet thorough definitions for commonly used internet elements--such as tags, bookmarks, blogs, and podcasts--are provided as well as little-known usage tips for expert surfers. Grouped by type, this detailed guide also offers dozens of alternative URLs that cover similar online territory, but with their own unique takes.