>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 <adt

>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.