I've been lurking here for quite a while before I started posting and I strongly suspect it's the ratio of upvotes to comments that trigger this. There may be a "recalculation" at 40 comments for performance or other reasons, but I've seen plenty of other stories with hundreds of comments and an equal or greater number of upvotes - on occasion passing 1000 - that stay on the front page for the better part of a day.
Let's wait for the official answer, but I also include my take.
Maybe because of the community growth. When I began to hang out around here, 6 months before I created an account I believe, 40 upvotes was a huge amount for a post or a comment.
Today it's common to see posts with more than 100 in the front page and comments receiving 60 or so.
EDIT: The number of comments in each posts also exploded, 20 comments in a thread used to make it very active.
Hardly a strange coincidence. How strange is it for posts to get at least 42 comments at some stage in their existence, and for this to be one of them?
Could be automod stuff. I have read a few hypothesis a couple of times about things that can trigger automodding, like many upvotes but few comments, or lots of deeply nested comments very quickly.
I'm seeing a pattern here (I gotta start timing this):
Many comments start out with an even number of slowly incoming VOTES, and once one or few of those comments hit a critical mass in up-votes they gain rank much quicker: there is noticeable ACCELERATION in the uptake. I suspect we could have a herd effect going on, where people are not really reading the comments, but confidently up-voting what other people have up-voted.
Also, many stories sit around for a while (at the top), before anybody comments. Then traffic in COMMENTS trickles in slowly, and after a critical mass of comments, again, the uptake ACCELERATES. Here I suspect people are waiting for other people to claim the space.
In my experience (And observations), depending on _interest_ posts start gathering comments after at least the hour mark. This post right now is 25 mins old, although its' weird that it's so high in the front page (Probably a slow Saturday)
It has been this way for years, so it's definitely no accident. Posts that elicit more comments absolutely end up getting ranked higher by The Algorithm™.
Regarding the comment count drivebyacct2 mentioned, I consider it a good sign when a story has a high upvote/comment ratio. 32/6 (soon to be 7) is pretty good.
This is off-topic, but how is it that this is the top story on HN right now with zero discussion (assuming that by the time I click "add comment" I am the first to comment).
Is it dumb to assume that it's normal for upvotes and comments to increase at a similar rate?
Stories with lots of comments get a ranking penalty. It's done with intentions of stopping flame wars. (I don't know if it's effective.) It happens around 40 comments or so.
Comments outnumbering votes is one of the heuristics used to determine if a thread is likely to be toxic rather than promoting good discourse, so that may be what dampened this off the front page.
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