I don't think Google is that good with integrating all the data they have. For example they still show me Google Chrome ads on pages I open with the Chrome brow

I don't think Google is that good with integrating all the data they have. For example they still show me Google Chrome ads on pages I open with the Chrome browser. I also doubt Google AdSense would show me ads based on the contents of the referring page (as a limited form of http://en.wikipedia.org/wiki/Behavioral_targeting http://en.wikipedia.org/wiki/Behavioral_targeting). Also Facebook could use all the external links you post or click to build a profile of you, but their limited keyword ad targeting indicates they don't.