Whereas the overall click fraud rate isn’t increasing, it’s not decreasing either, remaining flat for the first two quarters ofClick fraud in Q2 of 2008 reports ZDNet.

The article says more sophisticated botnets are to blame according to data gathered from the Click Fraud Network, consisting of more than 4,000 online advertisers and agencies.

Click Forensics report for the second quarter of 2008 indicates botnets continue to be used for click fraud being the preferred and more efficient approach compared to hiring human clickers on a revenue sharing basis.

Some of the key findings from data reported for Q2 2008 are available from blogs.zdnet.com/security/?p=1555.