I am just exploring the Group Options now for a Board I am setting up. It would be helpful if we would be able to have the ability for people to "Request Approval to Join" a group (we should be able to select what group(s) have this request to join setting.
Even further, similar to how facebook does private groups, we should be able to add questions/etc. that they would have to answer in order to join. It would be great if there was an option to have them upload something to it as well in case u want them to upload documentation of membership status to organizations/etc.
This would be very helpful in populating the groups with relevant members that we may not know personally!