Forum Moderators: martinibuster
Probably more important however is the fact that they can tell if the same computer has been clicking on a lot of AdSense ads, though IP and cookie tracking.
One thing's for sure. Google knows more about your site, your traffic etc than you do. The fact that they have tons of stuff on other sites as well also puts them in a good position to do comparisons. You don't have a chance in hell of knowing a fraction that they do.
But they "Do no evil". So I wouldn't be worried about it for the moment ;)