[rubicon33]

I agree, but also worth mentioning that Discord really did Chatrooms correctly.

The ability to easily create servers, invite users to your server, and then make that server your homebase with its own channels and emojis, is pretty novel and perfectly fit into the gaming community which is basically a loosely connected graph of friend groups.

[jaquers]

Also, RBAC which allows huge flexibility for users to run their community in whatever fashion they want.