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Google+ was launched on June 28, 2011, as an invitation-only site during beta testing. On September 20, 2011, Google+ was opened to everyone without the need for an invitation.
On December 27, 2011, it was reported that Google+ had surpassed an estimated 62 million users.
About 625,000 new users a day were joing Google+ and there may be a total 400 million members by the end of 2012.