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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 dtft on Tuesday August 29, 2017 @01:21PM (#15125908)
Looks like they don't! Must be a different retargeting technique used by Amazon. FB Pixel could have also been on manufacturer's site.
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