Click Forensics released industry pay-per-click (PPC) fraud figures for Q2 from the Click Fraud Index (ClickFraudIndex.com). The overall industry average click fraud rate was 15.8% for Q2 2007. This is an increase from 14.1% for the same quarter in 2006 and 14.8% for Q1 2007.
The average click fraud rate of PPC ads appearing on search engine content networks, including Google AdSense and the Yahoo Publisher Network, was 25.6%. That's up from 21.9% for Q1 2007 and 19.2% for Q4 of 2006.
Traffic from botnets doubled from Q1 to Q2 2007 and contributed significantly to the increase in click fraud rates. In Q2 2007, the greatest percentage of click fraud originating from countries outside North America came from France (5.1%), China (3.2%) and Australia (3%).