Alt.StarTrek.Creative has been going since at least February 1991, with posts dating to May of 1990 (but they might be strays, there's only one or two a month).
Trekiverse is the no-longer-updated archive, with at least ten thousand Star Trek stories and a couple hundred ENT stories.
So, almost as long as there has been an internet, there has been Trek fan fiction on it.
The group itself is still active.
