preventing click fraud 

preventing click fraud

It's almost imposible to filter of a good clickbot if you don't have access to logs of both the search system and advertiser. SE just redirects an http request to the advertiser's site; they can't analyze anything exept this single request. These bots don't care about the advertiser, they only want to go through the SE redirection, and that's what they do.

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Bigger engines are bigger than small once :) The number of affiliates, the level of knowledge and experience of affiliates, mix of fraudulent traffic with real one in different proportions, usage of diverse and elaborate scam technologies, clickboting competitors links using SE listings on different distributors sites etc. lead to the situation when you can't always tell the difference between right an wrong.

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Without going into much details, I would still insist that 10% or 20% of fraudulent clicks or even more is about as good as it gets for a second tier PPC SE. They very conserned about traffic quality, but their business model doesn't let them get much better.

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