SAN FRANCISCO - Like thousands of other merchants, Tammy Harrison thought she had struck gold when hordes visited her Web site by clicking on the small Internet ads she purchased from the world's most popular online search engines.
It cost Harrison as much as $20 for each click, but the potential new business seemed to justify the expense.
Harrison's delight dimmed, though, when she realized the people clicking on her ads weren't really interested in her products.
She was being victimized by "click fraud," a scam that threatens to squelch the online advertising boom that has been enriching Google Inc., Yahoo Inc. and their many business partners.
The ruse has different twists, but the end result is usually the same: Merchants are billed for fruitless traffic generated by someone who repeatedly clicks on an advertiser's Web link with no intention of ever buying anything.
Harrison figures she has spent about 200 hours documenting the mischief that drained her budget and diverted customers to a competitor, costing her an estimated $100,000 in sales.
"Click fraud has gotten out of control," said Harrison, who sells computer software to doctors. "It's stealing money from my pocket. It's just as bad as someone walking into a store and taking a television."
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Click fraud is like a big elephant standing in the middle of the living room," said Lisa Wehr, president of Oneupweb, a search engine advertising consultant. "Everyone sees it and knows it's there, but no one is quite sure what to do about it."
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Stricchiola believes it's only a matter of time before advertisers become so exasperated with click fraud that they file a class-action lawsuit against a major search engine.