[rrrrrrrrrrrryan]

> Hot is not a recommendation algorithm -- everyone has the same hot list. It's literally just a sort of votes.

Is that true? How do they decide when a post falls off the feed?

It's clearly a velocity calculation of some sort, but I'm sure it's been tweaked and changed over time. But how? What's the actual calculation? Does it vary by subreddit? If they published the calculation/algorithm, would it matter?