alt Hacker NewsSo 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.
Replies
gruez • yesterday at 8:04 PM
More importantly it's privacy preserving because it doesn't allow for bidirectional communication, which third party cookies could do.
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.