Impression Fraud on Adwords

Here is an article on MediaPost discussing impression fraud, and related topics with Google Adwords...check it out.  More good insight.

Is Impression Fraud More Dangerous Than Click Fraud?
MediaPost Publications - New York,USA
As most advertisers now know, the Google Adwords algorithm had a "technical issue" on Feb.16, as announced on Inside Adwords on Feb. 20. ...