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While it is true that the requests that load the ads don't include the referrer, any Javascript loaded directly into the page can access the referrer (window.lo

by tghw 16y ago

While it is true that the requests that load the ads don't include the referrer, any Javascript loaded directly into the page can access the referrer (window.location.orgin). A lot of ad networks work this way, meaning they do have access to those search terms.

kleinsch 16y ago
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.