I think it's possible but not in Google Adsense because it's very rare to find big companies using it. Maybe that's possible if your using DoubleClick (MOUNTAIN VIEW, Calif., (March 11, 2008) – Google Inc. (NASDAQ: GOOG) announced today that it has completed its acquisition of DoubleClick, a company that offers online ad serving and management technology to advertisers, web publishers and ad agencies.) Please don't get me wrong, I was not referring to double clicking the ads