Mashable reports that Facebook is expected to reach the 500-million user milestone during the course of this week.
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Facebook reaches another milestone
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Facebook is more memorable than books
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Facebook to let users 'subscribe'
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Angry Birds hits 500 million downloads
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Facebook takes world by storm
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Facebook wants to get in on computer hardware as well
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Facebook launches behavioural advertising
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Webtrends announces Facebook measurement capabilities
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Employees spend 15 minutes a day on Facebook
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Two million Xbox 360 owners use Facebook in the first week
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Facebook surpasses Google as the most visited Web site in US
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Facebook adding more advertisements
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Facebook helps in socialization:
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Facebook added to Nasdaq-100 index;
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LinkedIn reaches 200 million milestone
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Storylane will join forces with Facebook
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Google Plus gaining ground in social networking