What's green and square and sits on your Web page? ShareThis

Sharing isn't just for kids anymore. Thanks to a Cincinnati start-up, it's now one of the hottest ways for grown-ups to keep their friends up to date on their favorite things on the Internet. If you've been sharing content with your Facebook friends or email contacts then you've probably seen the little green symbol from ShareThis, a young start-up that hopes to become the big name in online sharing.

Much like Google 10 years ago, which dominated the world of Web searching, ShareThis, founded by Tim Schigel, wants to be the ubiquitous choice of Web surfers to share information from visited websites with their friends and contacts...