Hi Duncan
If you go into Edit Settings, there is a checkbox for content network Uncheck that.
My reasoning is this. From our findings, most click fraud occurs via AdSense ads. I guess this would be logical for the scammers. That is, if they are going to engage in click fraud they might as well pay themselves for doing it. However, it's not only that by any means. We found our ROI increased a LOT when unchecking content network as most were just browsing.
It is my opinion that those that are looking to buy, will search. It's unlikley that someone on another site will see and AdSense ad and decide to buy on that alone.
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