There used to be a Tor onion forum like that, "talk.masked". It was linked from Core.onion (eqt5g4fuenphqinx.onion). I believe that it was one of the first onion sites.

As I recall, nothing was ever deleted. It was classified, and you could filter as you liked. But I don't remember specifics.

The owner took it down some years ago. Because the trolling had become intolerable.