Discord servers seem to be the place where it is happening right now. There are still some community forums, and maybe Facebook groups. On a more public scale,

Discord servers seem to be the place where it is happening right now. There are still some community forums, and maybe Facebook groups. On a more public scale, there are some well managed subreddits. Edit: Plus the oldschool, geeky stuff like BBS, usenet, mailing lists, IRC etc... that still exist but are usually limited to technical people and subjects.