How to get facebook to stop putting those trick advertisements on other peoples' walls?

[Amazir ...]

I've noticed this happening too! There are a few things which may be going wrong.

If you're adamant you never clicked on them, then it's possible that an application you are already using is the culprit. Check the permissions of your applications, and make sure that they aren't allowed to post to your wall at all. If you cannot remove the permission, then I suggest you don't even use that application because it isn't worth it.

Another possibility (which may not be the case since I'm not 100% sure if this is possible) is that one of your friends allowed the application to interact with you in some way, which caused you to automatically interact with it and for that to happen? I'm not sure if it's possible though. It might be tied in the the App/Game "accept this gift" type thing, maybe its possible to auto-accept "gifts"?

If that is indeed the case, or something similar, you could either block the application sending these messages (in the timestamp, you should see something like 2 hours ago via such-and-such; click on the such-and-such will take you to the app page allowing you to block it). Or, go Privacy Settings > Edit your settings for using apps, games and websites, then click "Edit settings" beside "Information accessible through your friends". Then make sure they are all unchecked.

Another good prevention would to be to educate all of your friends on this matter: not only will you be better off, but so will they!

I hope this answer was helpful