The Interactive Advertising Bureau has published guidelines for determining when fraudsters are taking advantage of pay-per-click (PPC) advertisements.
PPC ads, which most often appear as text boxes along with search results, are the most popular online ad format yet are vulnerable to click fraud. The subject has long been controversial: advertisers have sometimes complained that the major search engine companies minimize the severity of the problem.
The guidelines establish basic procedures for determining when an ad buyer should or should not pay for a click. Google, Yahoo and Microsoft collaborated with the IAB on the guidelines.
"The recommendations established in these guidelines provide the detailed definition of a 'click' and the standard by which clicks should be measured and counted, including the identification of invalid and/or fraudulent clicks," reads the document, released on Tuesday.
Invalid clicks happen when PPC ads are clicked on with malicious intent or by mistake. For example, a competitor may click on rivals' PPC ads in order to drive up their ad spending. Also, a publisher may click on PPC ads on its site to trigger more commissions. In those two instances, invalid clicks are considered click fraud. However, invalid clicks also come from nonmalicious activity that nonetheless yields a click of little or no value to the advertiser, such as when someone clicks on an ad by mistake or two consecutive times.
Google, whose revenue comes mostly from PPC ads served with its search results or on the sites of partners, has often locked horns with click fraud detection vendors over their estimates of click fraud incidence and their methods for counting invalid clicks.
However, one of the click fraud detection vendors with which Google has often clashed, Click Forensics, participated in the project to come up with the PPC guidelines, a sign that the two companies may now find more common ground.
In January Google questioned Click Forensics' methods and accuracy, in reaction to its fourth-quarter report, which estimated that 17.1 percent of clicks were fraudulent.
"These estimates continue to count clicks Google does not charge to advertisers as fraudulent, so they are not actually click fraud estimates," a Google spokeswoman said via e-mail at the time.
"Furthermore, their estimates have never reflected the invalid click rates we see at Google, which we have previously stated have remained in the range of less than 10 percent of all clicks every quarter since we launched AdWords in 2002," she said.
Google didn't immediately respond to a request for comment on Tuesday, but in the IAB's press release, Click Forensics' President Tom Cuthbert said his company was proud to participate in the effort. "The work of the IAB and member companies has produced an excellent document that is a solid first step in this process," he said in the statement.
The guidelines provide detailed definitions and descriptions of different click scenarios, discusses what constitutes valid and invalid clicks, addresses methods for filtering clicks, including invalid ones, and provides auditing and reporting principles and parameters.
The guidelines should be a big help, considering that PPC ads account for more than 50 percent of U.S. Internet ad spending currently, said Caroline Dangson, an IDC analyst.
"One of the biggest challenges for online advertising these days is a lack of standards. IAB's new click measurement guidelines are a step in the right direction," Dangson said via e-mail.
Given the recession, advertisers are under great pressure to make sure they are getting the maximum return on their marketing investments. This makes the PPC model even more attractive, since they only pay when ads are clicked on, she said.
"Web pages are full of links these days which makes it much easier for consumers to make faulty clicks. Advertisers want to pay for intentional clicks that could lead to a conversion instead of accidental clicks that turn the consumer away," Dangson said.