Click Fraud Costs Advertisers $800 Million, Study Says

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. 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."

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