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.
http://money.cnn.com/2014/02/04/technology/facebook-data/index.html

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