Byline: abbey klaassen

What it is: A tool that helps you keep track of the content your friends are sharing online and allows for discussion around that content. It's been compared to Facebook's newsfeed feature, except rather than telling you what your friends are doing on Facebook, it aggregates many of the different actions your online friends or contacts engage in when they're not on Facebook.

Who's using it: The site opened up to everyone at the end of February and so far is popular with bloggers and Twitter users.

Who's behind it: A bunch of former Google execs man the start-up. Bret Taylor, a former Google product manager, and Jim Norris, software engineer, ...