We've also got information on Atlas that goes over updating to v3 as well as details on the pages and quilts. But yea @JacobBo is correct. One additional note that I forgot to mention. Although you are unable to select an entire Group Hub, you can select a specific node within the group hub, so a forum or blog from the private messages UI which will message all members.    ... View more

@Toby  the intent is to use the Group Hub as the way to message members in the group. Once they join, they'll be subscribed to updates, and depending on their notification settings, they can get a private message in their inbox letting them know of a new post. Our overall strategy was to bring folks back into the conversation and stay updated on all of the group activity within the group hub. While we have thought about and explored options to send private messages, we chose a route that attempts to continually bring folks back together and provides awareness across the board.  An alternative option would be to broadcast a message to users of a Group Hub using the recently released Private Messages v3. There isn't a one-click to send to the entire Group Hub, but you could send it to multiple users using this functionality.  ... View more