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My question is, would I get nuked by the big G for this. I feel like it is very risky. Anyone else try this before?
None of the major search engine spiders use the HTTP_REFERER header when making requests for pages, so they will see the same content every time.
I think the "line" TomJ was talking about is that you should keep the changes to a minimum. Only swap out the ads based on the HTTP_REFERER header, and don't swap out lots of content.