Ye' old general discussion board. Basically, for everything that isn't covered elsewhere. Come here to shoot the breeze, shoot your mouth off, or whatever suits your fancy. This forum is not for asking programming related questions.
Google Ads probably uses the same tactics as are most effective - mixing page content, with IP or other information. Doesn't need to have personally identifiable information to be effective.
If they can follow the specific line of searches patterns of people that are searching they can analize and come up with the algorithms that will help people to find what they are looking for. And it may seem short sided of me but i believe to do so you need a larger sample size and 7 months doesn't seem to long. As long as they aren't tracking more specific data than an ip that has no real validity than it doesn't bother me much.