Its kind of like the concept behind comments.

Articles that display a large amount of comments are likely to catch readers eyes for the same reason. The Huffington Post discussed this concept in a recent interview with WebProNews More WebProNews Videos This week, a company called Mesiab Labs launched a service that is practically identical to Tweetmeme, at Retweet.com. Obviously, this company is hoping to cash in on the popular concept, while injecting a powerful brand to go along with it.