My favourite is a private local slack group. It is a group of mainly software devs who chatted on public groups and dealt with a couple of trolling / bad behavi

My favourite is a private local slack group. It is a group of mainly software devs who chatted on public groups and dealt with a couple of trolling / bad behaviour situations, so we made a private invite only slack. It's really nice, it's super active compared to even much larger interest based chat groups I'm in. It's a safe place, it has about 60 members, I've met a lot of people in it in person. There are some other employees of the place I work on there, which is a little awkward because I'm a team lead and I goof off there a bit, but there are private channels (private within private!) for the core group.