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Social Search Web 2.0 Sites Categorized

With the evolution of social media, social search has been taking a shape of its own. There are a number of social search products that have emerged and become very powerful in a very short period of time. Search Engine Watch recently published a two part series written by Chris Sherman which first describes social search and its history and then introduces all the various types of social search products currently available. The second article breaks the social search products into six categories:

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

I would highly recommend checking this article out for more detailed analysis of each of the six categories.