Google+ is a social networking service operated by Google. The service launched on June 28, 2011, in an invite-only testing phase. Google+ will be built as a layer that not only integrates different Google social services, such as Google Profiles and Google Buzz, but also introduces many new features including Circles, Hangouts, Sparks and Huddles. It has been said that this is Google's biggest attempt to rival the social network Facebook, which had over half a billion users in 2010.Users of Google+ will be able to see updates from those in their circles through the "Stream," which is similar to Facebook's news feed. The input box allows users to enter a status update or use icons to upload and share photo and videos.