With these options you can control the use of social groups.
vBulletin Options > vBulletin Options > Social Group Options
Social Group Name Maximum Length
Enter the maximum number of characters allowed in social group names. Names longer than this limit will be rejected.
Social Group Message Moderation
When enabled, all new group messages are placed into moderation. This can also be enabled in usergroup permissions.
Enable Social Group Messages
If you select this option, members of each group will be able to post messages in the group. Users who are not part of the group will still be able to read the messages.
Allow Groups Owners to Force New Group Messages into Moderation Queue
This option allows a group owner (with the Manage Own Social Groups' Content Permission) to set the group so that all Group Messages are automatically sent to the moderation queue.
Enable Social Group Pictures
If this option is selected, any users with albums will be able to add pictures from an album to groups they belong to.
Allow Join-to-View Groups
When set, this allows the creator of a group the option to only show contents (messages, pictures) of the group to members of that group (or Administrators and Moderators).
Allowed BB Code Tags in Social Group Messages
This setting allows you to enable and disable the use of various BB codes in group messages.
Allow Owners to Delete Social Group if Empty
This option will allow any group owner to delete a Social Group if they are the only member of that group (even if they lack the "Can Delete Own Social Groups" permission)