I just noticed a message on one of my pages saying "Check Your Spam FilterPosts likely to be spam appear here. You can review, remove or approve these posts at any time." and from the Help pages: "Facebook is now helping Page admins ensure that the most valuable content posted by users on their Page wall is more visible to anyone viewing the Page. We are now offering automatic content filtering on Page walls that will ensure that posts soliciting spam are removed from public view as well as ensure that posts containing good content remain more visible." Then I noticed a new option in the wall settings next to Just others - Spam. In fact, the spammer will continue to see the posted message and all of their friends will see it, but no one else, and admins can unmark messages as spam if they want to. Seems like it will be much harder now to post on random walls.