TweetMeme
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TweetMeme is a service which aggregates all the popular links on Twitter to determine which links are popular. TweetMeme categorises these links into Categories, Subcategories and Channels, making it easy to filter out the noise to find what you’re interested in. TweetMeme was built by a small web company called fav.or.it.
Source: http://www.crunchbase.com/company/tweetmeme