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The real way Facebook knows so much about you (and how to stop it)
Fox News
Facebook knows what you do elsewhere because you might have connected apps sharing your data, but you can stop that.
On Facebook, your activity speaks volumes. Say you join a "buy nothing" group. Facebook might guess you value sustainability or just love saving money. This detail goes into its highly specific profile of you. Tap or click here to get free stuff in your neighborhood.
Facebook also knows what you do elsewhere because you might have connected apps sharing your data. You can stop that.
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