Shared bookmarks & web pages
Del.icio.us, Shadows, Yahoo's MyWeb, Furl and Diigo
Collaborative directories
Prefound, Zimbio and Wikipedia
Taggregators
Technorati, Rojo and Bloglines
Personalized verticals
Eurekster, Rollyo and Yahoo! Search Builder
Social Q & A sites
Yahoo Answers, Google Answers, Answerbag, Wondir, Yedda and Live QnA
Collaborative harvesters
Digg, Netscape, Reddit and Tailrank
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