Number of active users at Facebook over the years
Friday - 5/18/2012, 10:49am ET
(AP) - Growth in the number of active users at Facebook, defined as someone who logs on at least once a month:
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.
Source: Facebook Inc.
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