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Ghostery (they may be evil, it seems they've mutated into a company selling "insight" about 3rd party tracker blocking, insight they gather from their users usage of their browser extension!) blocks close to a thousand 3rd party trackers. Yes there are that many.

Even without an FB account, it's interesting how Fb probably has a profile of you from your friends. If you have 5 friends who use FB and they upload party pics of you 6, FB can probably nake a profile of that "ghost" through your friends' characters. E.g. All 5 like metal, all 5 checked-in to a metal concert/the FB app places them there, and there's a pre-concert photo of you 6, the machine can conclude the ghost (you) probably like metal too. And it already has your face in its face recognition database...




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