Board Thread:Support Requests - Getting Technical/@comment-1504072-20130103191808/@comment-4674838-20130103200300

You can report bad advertisements to Wikia and they might remove them or offer other advice.

One thing you could also do is redesign the background image of your wiki so it's not white in the middle. If done right, you could make it appear more natural even when that area is exposed. (Make it a color that blends in better, like a gray ish color that matches the rest of the background.)