Google Buzz rolls out to GMail Tuesday afternoon, in a move that challenges Facebook and Twitter.
Before the familiar groan – "Not another service to learn and subscribe to," hear this: If you're a GMail user, Google Buzz is baked into your inbox. Beginning this afternoon, GMail users will start to see a new tab pop up under their inbox. And instead of having to request friends or build up followers like we all did with Facebook and then Twitter, Buzz's network draws from user's GMail history to build a community of people he or she already connects with. In short, if you already email and GChat someone, you're automatically linked on Buzz.
How is Google Buzz different from Facebook and Twitter? In many ways it's very similar. Users can post new buzz by sharing links, photos, videos, and status updates. You can comment on and "like" friends' postings just as on Facebook, and send @ messages to get specific users' attention much like on Twitter.