So they “reinvented” HTTP cookies but with only advertisers?

> Technically, the way it works is that a script running on a site with ads asks the browser to record an ad impression. Then the browser keeps a record of ads seen from all the sites you visit. Later, when you buy something, the retail site can ask the browser to generate a “conversion report” that can be passed to a centralized aggregation service.

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Ajedi32 5 hours ago | parent | next [-]

Sort of. Cookies track you as an individual with a unique identifier. The conversion report only tracks anonymized aggregate statistics that can't be used to identify you as an individual.

	▲	xmcp123 3 hours ago \| parent \| next [-]
		This sounds a lot like “you’re getting analyzed by AI/ML, tied to a specific bucket of similar users, then your continued data expands the bucket, splitting off into different adhoc buckets of similar users” If so, you can’t be tied to a specific purchase but you can be so tightly grouped it’s basically the same.
	▲	5 hours ago \| parent \| prev \| next [-]
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	▲	troupo 3 hours ago \| parent \| prev [-]
		> The conversion report only tracks anonymized aggregate statistics that can't be used to identify you as an individual. Combined with the other 200+ tracking points from your machine... Yes, yes you can be identified.

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gruez 5 hours ago | parent | prev [-]

More importantly it's privacy preserving because it doesn't allow for bidirectional communication, which third party cookies could do.