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How Do I Prevent Facebook Wall Posting?
If you do not want the posts your friends make on your timeline to be visible to the other people on your friends list, go to your Privacy Settings page, click on
"Timeline and Tagging" on the left.

Then look for this part of the page that loads, and click on edit as shown here.
private facebook friend wall posts

Then you can use the standard audience selector to prevent your friends from creating new posts your timeline.
private facebook friend wall posts

Note: You cannot make it so people can see the post, but cannot comment on it.