What would a site with threaded bump-order ranking look like?

Question

There's a lot of forums, like this one and Reddit, which have threaded discussion and voting. Classic blogs often have threaded comments, but just sorted on date posted.Classic forums move the thread to the top each time someone responds, but they don't thread the comments.This seems like a much simpler solution, which is much harder to game. Yet I've never seen a site actually use it in the wild. How come?

josquindesprez · Accepted Answer

I imagine for popular posts, you'd get way too many low-value bumps: lots of leaves in the comment tree would be low-effort back and forth replies of uninteresting content (e.g. Reddit). If there's a voting system, the top-level thread would get bumped a lot but it'd be difficult to find that low-value content. The signal that the bump is trying to convey (there's new and good stuff here!) wouldn't match the value of the information that the user gets (the scattered dregs of many conversations). If there isn't voting and you sort by newest content, the experience would probably be like 4chan in slow motion: bump ordered blasts of low-value replies.
In a classic forum, since posting something not only moves the thread to the top, but puts your post in a highly visible place (the end of the thread), it's a lot harder to have too many deeply branching side conversations with low value replies: there's a social norm against polluting threads.
For something like HN where comment trees don't get too deep and the replies are always meaningful, I think threaded bump ordered ranking could work.

gshdg · Answer

I&rsquo;ve seen classic forum software that supports comment threading.