the deleted threads forum is one of those secret forums. the others are probably like what gff has, which is a moderator hut and a development forum and whatnot.
recently there have been done researches on this and as it turns out:Board No 10: deleted threadsBoard No 11: banned user accountsBoard No 12: there the moderators talk excessive sdc talk which is not allowed to us Board No 13: This one is for secret dating. Board No 14: Piano bashing Board for frustrated pianists. You need a medical certificate from your psychiatrist to enter there.*whistles*
This reminds me of the NPR April Fool's joke in which they do a serious news story that becomes less and less credible as the story progresses.