It might be a useful feature to be able to invite Agnostic.com to join a specific group. For example if I know that member Joe likes collecting stamps and lives in Texarkana then I could invite Joe to join the "Stamp Collectors" group and the "Texarkana Residents" group.
Just a thought.
I still wonder how I was hunted down to take over a camping group so I could run two discussion groups on camping. If they can hunt me down to take over a camping group administration there ought to be a way for others to do the same thing.