Spyware watchdog Ben Edelman has unearthed a subterranean marketplace for search advertising that is designed to defraud advertisers and could potentially have a negative effect on the reputation of Yahoo!'s Overture advertising network. Some Yahoo! Overture affiliates are brokering ads on other sites and networks, even via spyware programs that automatically click the ads, thus billing the clients. Yahoo! released a statement about the practices, saying: "We are carefully investigating the claims that have been raised. Once we determine the sources of these implementations, we will take appropriate action."
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