Search engine ad pay per click (PPC) fraud continues to occur at a but more than one-in-four rate: for Q4 20098, Click Forensics showed search engine ad PPC fraud at 27.1%. But that's down a full percentage point from a year ago.
It's the increase in botnet-driven click fraud that gives industry watchers pause.
Click Foresnics's findings showed botnet PPC traffic up more than 2 percent over second quarter 2008.
The relative stability in the overall click fraud rates seems to indicate that anti-fraud efforts are at least holding the line.
The rise in botnet PPC presence reminds us that, as with so much else, the line keeps moving.