Facebook seems to have a rather strange idea of what open means... it claims to be an open group, yet there seems not to be a join button, instead there is an ask to join button and seemingly no information about who it is that one would be asking nor a "send query regadring policies of person or persons controlling who ets to join" etc etc etc. In other words it looks like a closed group with closed managers-and-roles list and closed policy...
-MarkM-
Nothing new here, Facebook all along has strange ideas about privacy and access control...