It used to be that the only reliable way to find information online was to use a search engine. However, with the advent of Web 2.0 (interactive, dynamic websites that promote or operate as social networks), people can now easily find information and websites that other human beings recommend. The most recent instance of this is social bookmarking, where in websites like Del.icio.us, Digg, and Furl allow users to share their personal favorites (bookmarks) with...