Facebook says it now has 1.01 billion people using the site each month, consistent with a status update CEO Mark Zuckerberg made a few weeks ago to mark the 1 billion threshold.
The figure is as of September and was disclosed Tuesday in Facebook's quarterly earnings report.
Facebook also says it had 584 million active users each day on average in September and 604 million using Facebook from a mobile device each month.
Here is a look at how the number of active users at Facebook has grown:
1 million — End of 2004.
5.5 million — End of 2005.
12 million — End of 2006.
20 million — April 2007.
50 million — October 2007.
100 million — August 2008.
150 million — January 2009.
175 million — February 2009.
200 million — April 2009.
250 million — July 2009.
300 million — September 2009.
350 million — End of 2009.
400 million — February 2010.
500 million — July 2010.
608 million — End of 2010.
750 million — July 2011.
800 million — September 2011.
845 million — End of 2011.
901 million — March 2012.
955 million — June 2012.
1.01 billion — September 2012.
Source: Facebook Inc.