I feel that ranks should be a combination of explicit and implicit activity. If a story link is followed a certain number of times, if a certain amount of time

I feel that ranks should be a combination of explicit and implicit activity. If a story link is followed a certain number of times, if a certain amount of time is spent on a page, etc. these indicators might contribute to an “implicit upvote” for a story or contribute in some way to its rank regardless of explicit up-votes. It’s also really important to have a good way to recognize and consolidate duplicates and reward them equally. Activity in a comment subtree should also implicitly increase the rank of a comment. I have occasionally seen comments that were mysteriously not upvoted even once, despite spawning multiple levels of subtree discussion; in such case, isn’t the comment implicitly “more valuable” by creating a lengthy discussion, even if no one ever explicitly upvoted it?