Most of the time, when you post a link on Twitter, the site automatically turns the URL into a TinyURL to save as many characters as possible for your actual tweets. It’s a smart idea, but not so useful for those of us who may be searching Twitter for an actual URL address.

But now with backtweets you can reverse those TinyURL’s and see who’s tweeting about a particular site online. Definitely useful if you want to get an idea of how your links are being passed around (especially since Twitter has no trackbacks).