Updated with data up to April 15, 2009 Summary: Current active users worldwide: 193+ million Share of active users for North America: 38% (=74.34 mio): 41% Male | 56% Female | 3% Decline to state Most quoted fact on Facebook user growth: The fastest growing group are Women over 55. The O'Reilly numbers confirm it, but it also shows that the age groups left and right of the 55 - 59 bracket also grow very fast!

O'Reilly: Updated Facebook Usage Stats