I cannot believe it, we received a threat from a disgruntled business associate that he would organise a campaign to cost us money through PPC.
I suppose it was only a matter of time before this occurred.
Have a problem with someone who advertises on search engines? Don't go for the let's boycott the company products routine - the cry has become let's cost them money and click on their PPC links.
Since it becomes a group activity it is even more difficult to track than other click fraud. Though no doubt some enterprising terrorist will set up AdSense and Yahoo Ad accounts for the activists' website so the click actions also fund the groups other activities.
It's a Brave New World.