Google Launches Google+ To Battle Facebook

"That’s where Google+ begins to diverge from Facebook, though. The focus of this social project is not on sharing with a mass group of friends, but on targeted sharing with your various social groups. To do this, Google uses a system called Circles.

Gundotra explained that most social media services (read: Facebook, Twitter) haven’t been successful with friend lists because they’ve been designed as a “tack-on” product rather than being integrated at every level. Gundotra also believes that current friend list products are awkward and not rewarding to use.

Google+ Circles is an attempt to address that challenge. The HTML5 system allows users to drag-and-drop their friends into different social circles for friends, family, classmates, co-workers and other custom groups. Users can drag groups of friends in and out of these circles."

http://mashable.com/2011/06/28/google-plus/#18163Google-Circles