Dan Thies published a post about how people have been hacking Google’s search results using proxies to get the original sites nuked as duplicate content. He also explained how to defend sites against the problem using free PHP scripts developed by Jaimie Sirovich.
Dan Thies stated he thought many of the proxy hijack accidents were not accidents at all:
Of course, not all proxies are being run by innocent people for innocent reasons. Some of them are actually designed to hijack content - to deliver ads, etc. Some people want to steal your content, and they want the search engines to index it. In fact, I would not be surprised if a large part of the overall problem isn’t caused by such people firing links at their own proxies.
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