Thus a common type is the free games for download type of site. Here is an example of a recent site applying to an ad network.

http://www.gameairport.com/ – “free flash games”, click on one of the first games.

You will see a page with lots of empty spaces where ads are supposed to go, e.g. “300*250 Advertisement” and this will proceed further down as you are led around to lots of pages with more ad links on them. Others include:

http://www.debugscript.com

Games are not the only category for questionable sites. Travel works well too — like http://www.Siteaffiliation.com

Click down into a flight search and you’ll find a broken link. But the first two layers look like a real travel site. It’s unclear what each of these sites does or will do but there is a large number of them proliferating out there, and you are certainly seeing them get into some ad networks. If they are just SEO/arb plays that is one thing – but anyone accepting “template” sites like these into their ad network should be on the lookout to see if anything odd happens… and let us know.