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Re:Facebook apologizes to users for Apple’s monstrous effort... by ric2b on Friday August 28, 2020 @05:35PM (#24310260)
I know your HN username is "noisy_boy", I can track your HN posts/comments but I have no idea who you are, where you live, etc.

That's how anonymized data _can_ work. Of course it's also easy to mess that up and leak data about the underlying person.

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