Pretty old fashioned but showing no signs of dying any time soon (I don't think) is city data forum. I guess it's like a forum equivalent of local communities on subreddit and Nextdoor.

Then of course there is Stack Overflow but that's more centered around getting/receiving technical help.

I have a little IRC channel/groupchat and I'm in a handful of groupchats. That's about it, really.

e621.net

fedi is the only large social media I use, otherwise I only talk in DMs or one small group of friends

I think nothing else besides some Discords sometimes sadly

I do sometimes hop on a few discord servers, but otherwise I don't really go outside of fedi and related communities

I browse Imgur a lot if that counts

Imgur for memes :V

None

do my friends irl count?

I love playing CYOAs, so any place I can find or talk about them with places is a place I'll love to visit. ;w ;

On Reddit there's r/makeyourchoice and r/nsfwcyoa. I haven't checked /tg/ yet but I know that's where it all started. If anyone knows anywhere else I'd love to hear!

I don't visit any outside of fedi.

There are others???

I like the post office: https://afternoon.dynu.com/index.html
Secret Area of VIP Quality: https://secretareaofvipquality.org/saovq/
most of the stuff I do nowadays is on discord though ;w; I guess that's just the nature of the beast (I MISS OLD SCHOOL FORUMS SO MUCH)

there's a lot of toxic/edgy humor on text & imageboards thanks to spillover from 4chan, but it doesn't change the nostalgia I have for the software itself. there are jerks and people using slurs everywhere, I'm not gonna let that turn me off of an entire platform, and I don't post in threads/read stuff with vile things in it.

I usually visit Krita artists and Blender artists forum