Number of active users at Facebook over the years

Associated Press
Number of active users at Facebook over the years

FILE -In this Tuesday, Oct. 2, 2012, file photo, Facebook CEO Mark Zuckerberg, center, addresses students of Moscow's State University in Moscow, Russia. Facebook's third-quarter results released Tuesday, Oct. 23, 2012, inched past Wall Street's expectations, offering evidence that the company is making inroads in mobile advertising, a longtime concern among investors. (AP Photo/Alexander Zemlianichenko)

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