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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 junkculture on Monday August 28, 2017 @08:53PM (#15121379)
Interesting. I whitelisted this site, and 2 of the 4 ads it displays on each refresh are from Facebook.

I've never had an FB account and they seem to know it.

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