Click fraud (False clicking on internet ads to increase click throughs) has grown consistently in the past year. Click fraud in Q4 2007 was 16.6%

Overall Industry Click fraud rate in Q4 2008 : 17.1%
Click fraud rate in PPC ads on Content networks like Adsense : 28.2%
Percent of click fraud that is from automated bots : 31.4%

Top countries (outside US) contributing to Click fraud:
1. Canada (7.4%)
2. Germany (3%)
3. China (2.3%)

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