Not satisfied with the default social groups messaging function? Social Group leaders can now create a standard forum for their group. Also, the group owner will be moderator of his/her new section. And the forum will be fully private if you haven't set your group to public, so it's just for you and your group members!
The section can be found in NB Lounge.
Only a group leader can create a section in 'Social Group Forums' AND the group need at least 10 members to create a forum. So make your group, invite people and start your own board! To create one, go to your group and click on the link 'Create forum' at the bottom (group leaders only).