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Re:Foursquare Closes $50M at a $600M Valuation by mikeryan on Friday June 24, 2011 @05:52PM (#2694044)
I dont think when Facebook said they had 500 million users that they meant they had 500 million active users.

From Facebook's Statistics Site

More than 500 million active users

50% of our active users log on to Facebook in any given day

http://www.facebook.com/press/info.php?statistics

Re:Foursquare Closes $50M at a $600M Valuation by phereford on Saturday June 25, 2011 @09:58AM (#2695651)
Okay. My point is what is active? Someone who logs in once a year? Once a month? Sure 50% of "active" users log in once a day, but what about the other 50%?
Re:Foursquare Closes $50M at a $600M Valuation by dillydally on Saturday June 25, 2011 @01:53PM (#2696132)
For Facebook "active" has always meant "signed on within the last 30 days."