My facebook keeps posting ads on my wall that I did not post. How do I stop This?

[CloverBea]

It's what happens when you use apps, or like any pages, take quizes etc..

What you need to o, is beside the link there should be a X (or delete) button. Click that, and a box should pop up that say "Accept" and on the bottom of the box there will be an option that says "Do not allow _____ to post thing to my wall without my permission" click the box, then click accept.
Nothing should come up on your wall after that!
Hope it helps!