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by callmeal 1943 days ago
>Is that true though? I thought it was well known that you can only access cookies from your own domain:

That's where ad networks come in. A cookie set by <adtracker> when you're browsing say nytimes.com, will be sent to that <adtracker> when you're browsing say reddit.com and that's how the adtracker know's it's the same person on both sites.