OneUpWeb's Lisa Wehr told Internet Retailer that click fraud is a big enough problem that most retailer need to deliberately protect themselves from it. Click fraud is the practice of clicking on ads - sometimes with automated programs - in order to increase the charges advertisers must pay for their search campaigns. "People in India are getting paid to click on ads," she said. "It's hard to tell how many millions of dollars are lost." OneUpWeb provides a fraud detection service that looks for certain patterns, but Wehr said some fraud methods are undetectable. Neither Google nor Overture, both fielding anti-fraud teams - divulge the proportion of clicks they've determined to be faked.