For private discussions/forums, it's not obvious to site members who they are sharing content with.
So for private discussion/forums, would it be possible to allow the site member to easily see who is a member of the private discussion/forum group ?
Here's a mockup of it on the main forum listing, but it would just be for private forums.
If the user clicked on the 'Members' text, it could show the discussion/forum group members.
If it didn't go on the main forum display page, it could maybe go in the Members tab, showing a list of private groups that the user has access to and the private group members.