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Want to know more about the people who are following you? Check out TwitterSheep, a free and simple service that analyzes your followers by what's in their profile information.
It's not always easy to tell whose posts are worth following. Statistics may be able to show which users of the micro-blogging service have the most influence.
Using Twitter's API, a new little service maps out your most frequently Twittered words. Who says "cheezburger" a lot?