Yesterday, someone asked me, "can a facebook application have it's own advertisements?" That is, if you develop canvas pages, can you show your own adds, independent of the adds which facebook puts in the big sidebar on the right?
The answer of course is yes. And I'd been meaning to show this for a while. Today I finally got around to it.
That's why when you browse these forums, you'll see small ads between a posts and it's comments. It's both a demonstration, and who knows maybe it will generate some money to support Drupal for Facebook.
If you dislike the ads, here's a way to avoid them: Click on 'my account', then 'edit'. On that form is a checkbox labeled "advertisements." Just uncheck and submit. Then ads will no longer be shown to your account. Cause at Drupal for Facebook, we're nice like that.