oct 29, 2013 - Google+ Hits 300 Million Active Monthly “In-Stream” Users, 540 Million Across Google

Description:

540 million monthly active Google+ users: This is the number of people with Google accounts that interact with Google+ each month in some way on any Google property. That could include leaving a comment on a blog or website that has Google+ comments embedded, commenting on YouTube, or clicking the +1 button on an article or some other web content.