If there was a browser plugin that would surf some random innocuous crap in the background for me, with an eye to messing up the data scrape, I'd install it. ( Fly fishing? sure. Country Line dancing? OK. Fancy goldfish? sign me up. ) A three for one ratio of random to real would make the data set pretty much crap for advertising purposes.

The only drawback, so far as I see, is wasting bandwidth of sites I don't really visit.