My first online forum was the Kargatane's Malodorous Goat Tavern, a Ravenloft fan community turned semi-official forum during the 3e days when Ravenloft was being published under the Sword & Sorcery line. I joined in summer 2002, a little over a year before they shut the place down and everything moved over to the Fraternity of Shadows website (which AFAIK is still the largest Ravenloft fan community online).