It appears that originally it was used for TripAdvisor to ask questions about certain travel subjects. I'm thinking that function is now replaced by the TripAdvisor Insighters Survey.
However - people are still finding that forum (I think it is still listed on the list of beyond destination forums) and posting answers to questions that were posted in 2008!
People sometimes post questions in there - no one finds them, they are just left unanswered.
There doesn't appear to be any reason to keep that forum open - would you please close it off once and for all?