The voting code in the copy of Arc HN runs is not public (the rest of it is - https://github.com/wting/hackernews/blob/master/news.arc https://github.com/wting/

The voting code in the copy of Arc HN runs is not public (the rest of it is - https://github.com/wting/hackernews/blob/master/news.arc https://github.com/wting/hackernews/blob/master/news.arc) because apparently business decisions are made off of it and it would be trivial to game it. That said, I'm fairly certain it involves some kind of "keep the ball afloat" algorithm, where more upvotes in a smaller time period gives it a higher internal score than a slower sequence of upvotes would. This post has been upvoted very slowly, and I theorise this is why it's on page >2.