Is no different than what Hulu does.. they allow you to click to respond if the ad is or is not relevant to you. You'd think advertisers would love to have that info and would want Google to expand on that.
I used to click every single ad was not relevant to me. Then I realized it was like responding "unsubscribe" to spam email, if I clicked, that would just confirm they had a real live viewer. Now I just get up and hit the can, or the fridge.
