Similarly, discussion is heavily skewed toward the first 5-10 comments on a post. If I think something is really interesting but it already has 100 comments, I usually don’t bother posting as I probably won’t get replies (which is the interesting part of commenting IMO). The sweet spot is a new article that I find very interesting with less than 25 comments. Then I often want to comment because I know it’ll appear close enough to the top that others will reply and discuss :)