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A comment on Ask HN: How does Facebook know what I buy on Amazon or vice versa?. Parent comment

Re:Ask HN: How does Facebook know what I buy on Amazon or vi... by tarboreus on Monday August 28, 2017 @05:12PM (#15120113)
It's probably not cookie-based, or not only cookie-based. Browser fingerprinting and user profiling have gotten very sophisticated, and don't think the big 4.5 aren't using these techniques extensively.
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