Google+, a social network operated by Google, Inc., launched on June 28th, 2011 with integrations across a number of Google products, including Buzz and Profiles.
One key element of Google+ is a focus on targeted sharing within subsets of your social group, which are what Google calls Circles. Circles are simply small groups of people that you can share to, each with names like friends, family, classmates and co-workers.
Also within Google+, Google has created a section specifically for viewing, managing and editing multimedia. The photo tab takes a user to all of the photos he or she has shared, as well as the ones he or she is tagged in. It’s not just photo tagging, though: Google+ includes an image editor (complete with Instagram-like photo effects), privacy options and sharing features.
Another feature that’s widely discussed is “Hangouts,” Google’s new group chat feature. Instead of directly asking a friend to join a group chat, users instead click “start a hangout” and they’re instantly in a video chatroom alone. At the same time, a message goes out to their social circles, letting them know that their friend is “hanging out.” Friends can then join the hangout as long as they have been placed in a circle that was invited by the person who created the Hangout.
via Google Plus.