I'm by no means a prolific commenter on HN. If I have something of value to add I'll try to ask; otherwise I usually abstain (but I'm only human, made a few dumb comments)
I just saw another article, http://news.ycombinator.com/item?id=2404157
and the two comments on it were either bashing IQ, or talking about penis size.
I feel like maybe the reddit/4chan community has started reading HN?
I felt like posting a comment on that thread asking, nay begging, for someone to post something interesting as a followup to the kids question in the video, instead we have.. I just don't know.
And after saying that, I have no useful suggestion. Any feedback system that is implemented can still/will be gamed.