Agree with 90x90x90 - reddit is really the last kind of really active forum esque realm. I will say dipping in here gives me flashbacks to some of the height of forums back in 2003-2006 for myself. Missing those flash game arcade plugins haha
I used to frequent various forums all the time, and made some really great friends through them. It's become a lot harder to find active forums these days. Definitely makes me a bit nostalgic thinking about them though!