Sometimes, legitimate posts on your Fan Page’s Timeline will be marked as “spam” by Facebook. It takes several steps to find those flagged comments and “unmark” them if you want the posts to show up on your Page.
Step 1: Go to your Page’s Activity Log
From your Page’s Admin Panel, click on the Edit Page button, then click on Use Activity Log
Step 2: View All Flagged Comments (Spam)
Click on the arrow to the right of the All button and in the drop-down menu click on Spam. [Update: there is now a drop-down menu titled "Posts and Apps" in place of "All". Click on the arrow next to Posts and Apps and then you will find Spam in the list]
You will see a chronological listing of any posts marked as spam. (Facebook decides what looks like “spam”. I’ve noticed more legitimate posts marked as spam recently, for no obvious reason.)
Step 3: Take action for each post
To “unmark” a flagged post, just click on the icon that appears in the upper right corner of each post.
Then choose to either “Unmark as spam” or Delete. Any posts you “unmark” will now appear on your Timeline, in the Posts by Others box.
I recommend adding this to your regular monitoring tasks, since you don’t want legitimate posts from your Fans to accidentally be marked as spam.
Image courtesy of Free Digital Photos.net