Admin should be able to hide flagged posts that have been deemed inappropriate. This way the post still exists for admin to review and admin can report on the flagging history to see what kinds of inappropriate content has been posted or if there is someone consistently posted inappropriate content. But, learners would no longer see the post in the collaboration. The only options for admin are to Delete the post (which loses its history) or to Review and Edit it, which does not help with tracking since the post will no longer show as flagged once it is reviewed.
I would also like to see a moderator role that could review a comment/post before it's published and approve or not approve that post.