I remember spending days agonizing over my avatar and my signature, creating animated gifs (from scratch, frame by frame in GIMP) for my “siggy”. I remember being weirdly proud of my post count on several forums, and getting excited any time I hit a new rank.
I also remember that they were more tight-knit communities, too. There are people I met of forums back in the day that I still think about, despite having lost touch 15 years ago. Nothing else has really filled that niche the same way forums did, sadly.
Oh, and I remember having my Geek Code in my signature! I’m sure that will ring a special brand of nostalgia for some people.