Facebook is actively blocking legitimate numismatic coin auctions on their social media site. If you use certain key words it can be blocked. I have been using the discussion feature instead but when I use a $ symbol Facebook will automatically convert my discussion to a sell format then flag it with a warning inside a red border.
Admins can’t see your auctions when they are in pending if Facebook has flagged them either. So I created a video to show you how to post and not get blocked.