PPC, PFI, PFC: Google Adwords, Overture & all that jazz

eMarketer: eNews - the latest Market Research, Internet Statistics

eMarketer: eNews - the latest Market Research, Internet Statistics: "Click Fraud a Growing Concern
...it is impossible to work out the extent of click fraud, Google and the other sellers of search advertising are mute on the subject, some marketing professionals believe that they account for up to 20% of paid search fees in certain advertising categories. Others say as much as 50% of cost-per-click advertising dollars are spent on fraudulent clicks. Big problem."

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posted by Jen @ 3:32 PM