Derived using average threat level across all industries and keywords monitored by the Click Fraud Network. Threat Level is identified as having a high attribute rating score as measured by the Click Forensics rating engine using data provided by members of the Click Fraud Network

Now in its third year, the Click Fraud Index monitors and reports on data gathered from the Click Fraud Network™, which more than 4,000 online advertisers and agencies have joined. The Click Fraud Network provides statistically significant industry PPC data collected from online advertising campaigns for both large and small companies across all the leading search engines. Key findings from data reported for Q2 2008 include:

• The overall industry average click fraud rate was 16.2 percent for Q2 2008. That's down slightly from the 16.3 percent rate reported for Q1 2008 and up from the 15.8 percent click fraud rate reported for Q2 2007.
• The average click fraud rate of PPC advertisements appearing on search engine content networks, including Google AdSense and the Yahoo Publisher Network, was 27.6 percent. That's down from the 27.8 percent rate reported for Q1 2008 and up from the 25.6 percent average click fraud rate reported for Q1 2007.
• For the first time, traffic from botnets was responsible for more than 25 percent of all click fraud traffic in Q2 2008.
• In Q2 2008, the greatest percentage of click fraud originating from countries outside North America came from China (4.3 percent), Russia (3.5 percent), and France (3.2 percent).

"Although click fraud rates were relatively unchanged in the second quarter, we found that the methods used to commit click fraud have become increasingly more sophisticated and difficult to detect," said Tom Cuthbert, president of Click Forensics. “The threat from botnets is the biggest concern as they have grown to cause over one quarter of all click fraud. Online advertisers should be extra vigilant in watching for traffic from botnets in their search marketing campaigns."