My first was a forum for fans of a TV program. It doesn't exist anymore but I was a moderator there. It was back in the early-mid '00s so I don't remember much about it.
I also had that bloated AOL software downloaded on my computer (not just the usual aol(dot)com but that thing you download lol) which I used for email and AIM. Also, I used the BROWSER on that thing... man I'm only 17 and already feeling old.
Edit: this is what I'm talking about... I don't know what you'd call this
It looked exactly like that.
(P.S. My mom still uses that shown above, except the latest version. Prayers for that she moves on in life will be appreciated.)