CNET News.com: "Online advertisers estimate that about 14.6 percent of the clicks on ads for which they're billed are fraudulent, costing them about $800 million last year, according to a study released Wednesday.
The study, called 'Click Fraud Reaches $1.3 billion, Dictates End of 'Don't Ask, Don't Tell' Era' and released by research and advisory firm Outsell, claims that 'Google, Yahoo and MSN...are stonewalling on click fraud, to their own and others' detriment.'
Search engines have refused to release figures on the amount of fraud in search advertising, most of which comes from Web sites boosting their revenue by clicking on ads on their own sites."
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