I think I was there around the founding of FF.net in 1998... that was my freshman year in college. x_x
Geh, I feel old. Prior to that, we got our fics off the rec.arts.anime.creative BBS system, which had a totally different culture than FF.net and emphasized quality over quantity. If I remember right, posts there are screened by editors before getting posted, and short updates are greatly discouraged. FF.net filled a void by allowing folks to sort by series and writers to post their stuff without mod intervention.
Edit: Checked, my current pen name was established in March 2001. I think that was when I was first brave enough to post a fic. Before that I just read stuff.

You may have been a member since then, I know I was, I had a whole slew of Rogue and Gambit of X-men comics fanfic (M rated but no more sexy than your standard historical romance published in the 1990's- I figured if that's acceptable to be available on store shelves in Kroger, Walmart, Kmart, etc... it's acceptable for anyone who was allowed to read M rated fanfics) They were quite popular amongst Rogue and Gambit shippers back in the late 90's-early 2000's, even some other ship people liked them. Even influenced a few to switch ships
But in 2001 they had this huge crash or something and lost a huge percentage of the pre 2001 fics and people's old profiles too, including mine. I never bothered to reupload my Rogue and Gambit fanfics because that was also when they first started doing the giant purging of M rated fics- at first it was almost every M rated fic, although they later eased off on that. I still had them on my old Geocities page, so if anyone asked I pointed them there. (Too bad Yahoo bought Geocities out then shut down all the free websites in 2010.) I still have the fics saved on my old computer hard drive but eh, they are so old, and although I'm still as much a Rogue and Gambit shipper as I was, the stories would be so far from the now totally messed up storylines in the comics that I don't want to bother with it- that's what happens when characters are owned by corporations, not writers and artists. It's fun to run into folks at conventions who say- "Wow, you're Ciardha? I loved your Gambit and Rogue stories!"
Guess all but the last is what makes me slow to upload my narusaku fanfics on FF net and quick to upload them on deviantart- besides it being easier to upload onto deviantart.
Dream you dream alone is only a dream, but dream we dream together is reality- Yoko Ono 1971
When you go to war, both sides lose totally- Yoko Ono
Remember, our hearts are one. Even when we are at war with each other, our hearts are always beating in unison- Yoko Ono 2009