I just followed the FaceBook link you created to the OO forum, joined, and read this thread as it echoes a desire of mine, how to find the pearls. I wonder if a 'counter' could be added to pick up reader feedback as to a 'like' or a 'helpful' evaluation, for both posts and comments. Each post could then show the number of views and a scroll through the threads would show how previous readers had evaluated the comments. Could that be an automatic way to find the most interesting comments?
I realize that does nothing for the FaceBook postings but could it address the previous discussion? For Facebook a daily 'most viewed' might be enough.