Let's say that you added your family to your FaceBook page, but your friends (or you ya naughty kitteh ) tend to post things on your wall that you just don't want them to see. Or maybe just some other people, anyone really ... and you still want them to be able to write on your wall. If you just block them from seeing your wall they won't be able to write on it either when they want to. One thing you can do is set your default posting preferences to not let them see any posts you make, and set it as your default posting preference so it stays that way. Like this:
Make sure you have "All friends" showing, then click on "Create a List" (unless you already have a list made with just the people you want already on it, then skip this and the next step).
Now where you type in your statuses, click the lock and choose "Customize" ... (Also, see the "edit" at the bottom of this post)
Type in the name of your new list in the "Hide this from" area; as you start typing it, it'll auto-show in the drop-down box, click the list name so it is added to the line, check this box that says "Make this my default setting" (this is the crucial part. It'll save this setup permanently so you won't need to think about doing this each time you add a new status, it'll automatically hide your statuses from the people you've added to your "hide from wall posts" list), then click "Save settings".
Now the people on your "hide" list shouldn't be able to see anything your friends post on yoru wall either.
Edit: Now that I look at it, it also appears you can use this method in your privacy settings area as well (instead of clicking on the "lock" where you enter your own statuses):
|"Wisdom cannot be given unless someone asks for it and shows a readiness to receive it."|