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 The technical issues surrounding groups, especially closed groups was discussed at #Nostriga 

The complexity of encrypting group messages is very nuanced and @JeffG is working on this.

The social part, I wholly agree with, we need the ability to curate groups or forums either closed or open and to have clients that enable that. 
 1) put the group on a relay
2) AUTH the relay
3) moderate the group at the relay level 
 I think this makes super sense for the "business" use case, too. Have a "slack" relay for your team. And only for your team. 
 Yes. Also, for something internal for a company or church or etc., so that you can have people at multiple locations accessing it, even if it's behind a firewall or VPN. Then it's an intranet server. You could even have a second relay that is "public" and post things there, that you want the general public to see. Updates to a company website or user documentation, etc. Makes sorting for your audiences very clear.

That sort of "slack" use case is on our GitRepublic IDE road map, so we are actively looking into that model.

Encryption might still be interesting, for that use case, but maybe you want to have a group read-only for nonmembers. If you are running an open-source software project, for instance, you might want to have some parts read-only and others open to the public. Relays remove a lot of the complexity and abstraction of moderation, and make it more resilient and persistent.