I was on Split Infinity more than was probably healthy, and then Digital Edge when SI shut down. I also used to call one-line message boards like Kronos II to play Trade Wars 2002 and talk about random crap. TW2002 on a one-line BBS was always so easy. heh.
I actually met a few of my current good friends on SI, years ago. I always liked BBSes because the people who called them were almost guaranteed to be local, and it was a great way to make friends.