from www.cnn.com – A porn site ad scam has hit advertisers, who have been tricked into paying for phantom traffic.

A group of pornography sites are using software that launches a flood of hidden pages with links that users never see. The software forces the user’s computer to click on the links, and the scam operator collects money for directing the fake traffic to legitimate sites. AT&T and Verizon are two companies who’ve ended up paying for hidden ads. Google has said it blocked the scam.