If you perform a search on these forums, the results listing includes threads that have been deleted by a Moderator. There is nothing to indicate if a thread has been deleted but if you try to follow the link to such a threrad you get the cryptic message "You are not authorized to perform this action." Surely this could be done better. There is nothing in the FAQ that I can find about this. Could not the message say something like "You are trying to view a page that is only available to forum moderators. This might be because you are following a link to a thread that was public but has subsequently been deleted by a moderator".