how to avoid my friends to post on my wall?...

yes you can block your wall :)

Yes it can be done without being as drastic as deleting your friends. If you want certain applications to be blocked for eg farmville, cafe world. On your wall, find a post, move your cursor over to the right of the box and an 'X' will appear. It will give you a few options, block poster, block application etc. Blocking application will only remove the notifications your friends send from that game, but it will still allow them to post comment etc on your wall. If however you want to completely stop your friends from posting on your wall, find a comment or application sent by them. Find the 'X' in the right hand, top corner and select the option to prevent all posts from that friend. I hope this helps and answers your question.

Hi sjroberts, You can do that easily, just go to the privacy settings. And select the option who can post on your wall, there you can change to "only me", if you dont want others to post on your wall.