Back with newsgroups the general rule was to go from general to specific. You start with a general discussion group and when discussions about video games get annoying you create a games group. If then there are too many Baldur’s Gate discussions you create BG. If they are dominated by Baldur’s Gate 3 you create a Baldur’s Gate 3 group. If everyone is fawning over Withers you create a Withers group which of course will be flooded with discussion about the Withers’ tits mod, which shall get its own group.
Meaning you should create a group when demand is there and not the other way around.
Actually just want to clarify here, in case this causes me to get roped into anything. I’m actually too much of a flake to rely on for being intimately involved in building online communities and shit right now. I might be active here constantly for months and then disappear without notice for a few more. Also, life is pretty shit, I’m in a years long rut, I’m bored of my current music rotation but somehow helpless to change it, my wardrobe is ancient and all of my cool shit is starting to fall apart, I’m constantly broke and I don’t even know how to make ‘friends’ anymore.
So while I call for and wish for these things here, I’d probably end up just doing a lot of lurking and wishing and saving posts for ideas or to get back to later (then never look at them again) anyway. So yeah, I’m not the one to make the community and promote it and shit. I just wish they were there to escape to.