When you sign up for Facebook, you enter into a bargain. You share personal information with the site, and Facebook agrees to obey your wishes when it comes to who can see what you post. At the same time, you agree that Facebook can use that data to decide what ads to show you, the New York Times reports. It is a complicated deal that many people enter into without perhaps fully understanding what will happen to their information. It also involves some trust--which is why any hint that Facebook may not be holding up its end of the bargain...
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