Who can access the "Wall-to-Wall" link that appears beneath Wall posts from my friends?

The "Wall-to-Wall" link is only available for people who are permitted to see the profiles of both individuals. This link allows you to see the history of Wall posts between two people. While it cannot be removed, you can restrict who can view this link on your profile by editing your Wall privacy.

To do this, take the following steps:

1. Choose the "Privacy Settings" option in the Account drop-down menu at the top of any Facebook page.
2. Select "Customize settings" in the "Sharing on Facebook" section.
3. Change the "Post by Me" and "Wall posts by friends" features to more restrictive settings.