"There is little about Google's business that is more closely guarded than the issue of click fraud. Company officials say they take the issue seriously and have zero tolerance for fraudsters who generate bogus clicks on ads in order to profit. The search giant says it detects most fraudulent clicks before advertisers are ever billed and that industry concerns are overblown. But Google won't discuss specifically how it detects bad clicks or what percent it deems fraudulent, only that it's "less than 10%," saying such information could be helpful to would-be scam artists."
"Marketers are already anxious about fraud. A study by the Search Engine Marketing Professional Organization (SEMPO) slated for release on Dec. 4 found that 71% of advertisers are "worried" about click fraud, or describe it as a "moderate" or "significant" problem. That's down slightly from a year ago, but still a sizable issue. "
http://www.businessweek.com/technology/content/dec2006/tc20061204_923336.htm
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