Do you get to choose whether or not 14-year old cheap tricks hawk for the FReepathon on your threads or are the more tasteless adverts simply the luck of the draw?
Excellent article.
They seem to rotate every time you refresh the page. So you can actually see several different adverts on the same thread if you come back a few times. The good part is that you're not stuck with the same one if it's offensive, but the bad part is that you'll see a wider selection.