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How Do I Make My Wall Posts Private?
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 choose who can see the posts created by other people on your timeline.
private facebook friend wall posts

If you made a bunch of public posts and want to set them to friends only, use this setting from the main privacy page:

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