So I had to disable all friends from writing to the wall.
It would be nice if I could either allow only specific lists to be able to post, or to allow people to post, but those posts would initially be visible to only me and the poster. They’d never know that not everyone can see it.
Once I see it’s a fairly safe post, I could then change it’s visibility (which according to Jay in another post on this site, is now possible, but I haven’t been able to confirm this).