This has nothing to do with advertising, so I've moved it out of that thread.
This is caused by an avatar which appears to be hosted at that site. My guess, from the quick searches I've done, is that the advertising on their site allowed advertisers to perform unwanted actions and it was reported.
It should be noted that the advertisers on this site cannot do anything except show a picture. The picture goes to Project Wonderful, which shows it here with a link to their site. It cannot perform any actions.