In many cases, ads are loaded in iframes, which hide the referrer from the ad ne...

		kleinsch on Jan 24, 2011 \| parent \| context \| favorite \| on: Search leakage is not FUD. Google et al., please f... In many cases, ads are loaded in iframes, which hide the referrer from the ad network. It's not in all cases, but most big publishers don't want malformed ad network JavaScript to destroy their entire page, so they wrap ad calls in iframes to protect against that.