Everyone that google can identify gets personalized ads based on what google thinks your interests are.
Yes. Maybe not subject of this thread, but adds are world of their own. I integrated google adds on personal site, primarily from curiosity; when I load page on Win box - 1 add. On Mac -- different add. And the other day loaded on tablet in BestBuy - got something completely different. The infrastructure they (google) developed for adds is quite amazing though, analytics, impressions, page RPM and who knows what else.
I do have problem understanding that business model; nobody likes them and will not click out of principle.
Don't think adds are problem for (new) CT though. Besides Adblock plus is free and effective.