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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 reustle on Monday August 28, 2017 @04:27PM (#15119790)
Does Amazon really use the fb tracking pixel? I wouldn't think so
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Re:Ask HN: How does Facebook know what I buy on Amazon or vi... by netsharc on Tuesday August 29, 2017 @07:16AM (#15123485)
Op said he visited a website that sold bicycles. If this website has a "Like" button or such a tracking pixel or Facebook analytics (do they have that?), Facebook would then know that OP is interested in this bike.

An effective ad network would know that OP already bought such a bike, so it's actually useless to try to sell him bikes... maybe accessories.

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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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Re:Ask HN: How does Facebook know what I buy on Amazon or vi... by jsjohnst on Tuesday August 29, 2017 @01:11AM (#15122219)
No, they don't.
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