What Facebook knows about you

Facebook has spent the past 10 years building a business upon your personal information.

The social network knows a lot about you. Clearly, it knows what you've told it -- your age, location, martial status, job, etc.

But it also knows what you like. This is based partly on obvious things -- you clicking the like button -- but also on less obvious ones. What you talk about in your postings, what content you share, even how long your cursor hovers over a particular image.

"They know more about your tastes and preferences than any company ever has," said Nate Elliott, a social media analyst at the research firm Forrester.

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