Indeed and Google has built its empire through tracking users across the internet so it is really hard to trust that they won't..
It hasn't. Their DoubleCkick/AdSense (embedded website ads) used tracking, but Google built its "empire" through AdWords (keyword ads in Google Search), not AdSense.
It hasn't. Their DoubleCkick/AdSense (embedded website ads) used tracking, but Google built its "empire" through AdWords (keyword ads in Google Search), not AdSense.