My community of event management professionals is currently running on Facebook for Work, but I wanted to give something else a try because of the costs of Facebook for Work. This is an excellent alternative.

There is one 'feed' and unlimited 'chat channels' so I have the ability to run the dozen or so sub-communities in this way.

One tiny negative is that I can only restrict new members joining based on setting a password.

It would be nice if I could restrict new joiners to only those with certain email domains.
The guy at Lounjee said this is coming, would be something that I would appreciate for sure.