BuddyPress.org

@Erich73 You need to look at the “Invite Anyone by Email too” Plugin: https://buddypress.org/forums/topic/invite-anyone-invite-by-email-too-please-help-test That satisfies the #4 and actually was going to be my comment about bringing people in.

This plugin is fully functional and if done right can be a great way to grow a BP site. Although, I think the plugin is still in it’s relative infancy and as it grows will become one of the invaluable plugins for those using BP.