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Those of us who know how the Web works know that every time you visit a page with a Facebook, Google+, or Twitter link, the code behind that link actually comes from Facebook or Twitter servers, so if you're surfing to that page with the same browser that you're currently logged into Facebook or Twitter with, then they know you're on that site. They know how long you spent on that site, how often you visit, and so forth. It's all very simple to do. Yet most people are cheerfully oblivious to this fact.
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