As of this writing, this post is 2 hours old, ranked #96 (4th page of HN), and has 117 points. I believe it was on the front page 30 minutes ago. This is a stee

As of this writing, this post is 2 hours old, ranked #96 (4th page of HN), and has 117 points. I believe it was on the front page 30 minutes ago. This is a steep drop in ranking -- what are the factors in the HN ranking algorithm that could contribute to this?