Avi Wilensky, a friend of mine, recently got a cease and desist letter from Realogy Corporation because his Design broad match ads for Mark David NY ended up on a dirty Design syndication partner site. In spite of many attempts to contact Design, they have remained silent on the issue, and continue to serve ads on cit-ihabitats.com, and thousands of other sites just like it.
Design could choose to attempt to keep their network clean, but there is too much money there to ignore it. They are the spam police telling you how you should link. They are not to be questioned in their business practices. When they screw up, it is the fault of an algorithm or a reflection of the democratic nature of the web, and they didn't know any better.
Designbook.com