In this March 25, 2015 file photo, Mark Zuckerberg talks about the Messenger app during the Facebook F8 Developer Conference in San Francisco. For the first time, a billion people used Facebook in a single day on Monday, Aug. 24.
In this March 25, 2015 file photo, Mark Zuckerberg talks about the Messenger app during the Facebook F8 Developer Conference in San Francisco. For the first time, a billion people used Facebook in a single day on Monday, Aug. 24. Eric Risberg Associated Press
In this March 25, 2015 file photo, Mark Zuckerberg talks about the Messenger app during the Facebook F8 Developer Conference in San Francisco. For the first time, a billion people used Facebook in a single day on Monday, Aug. 24. Eric Risberg Associated Press

1 billion people used Facebook on Monday, but what’s in a billion?

August 28, 2015 12:40 PM