An anonymous reader writes: Last week, during its fourth-quarter earnings report, Facebook revealed it had 1.23 billion monthly active users, 757 million daily active users, 945 million monthly active mobile users, and 556 million daily active mobile users. In its 10-K filing published on the weekend, the company estimated that in 2013, between 5.5 percent and 11.2 percent of these users were fake.
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