According to MediaPost, the percentage of ad clicks that are fraudulent is rising every year:

The overall industry average click fraud rate rose to 16.6% in fourth-quarter [2007], up from the 14.2% click fraud rate for the same quarter in 2006 and 16.2% for third-quarter 2007.

The average click fraud rate of PPC advertisements appearing on search engine content networks, including Google AdSense and the Yahoo Publisher Network, was 28.3% in fourth-quarter 2007 — up from the 19.2% average click fraud rate for the same quarter in 2006 and 28.1% for third-quarter 2007.

Interesting dilemma… Google maintains they have a less than 0.02% click fraud rate.  This article gives some validation to Google’s claims.

http://adwords.blogspot.com/2006/08/troubling-findings-on-how-some-third.html

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