The "past" link is a nice feature, but what I'd really like to see is a way of weeding out duplicate stories before they're posted. For example, today there were 9 similar stories posted (so far) about Facebook's new "dislike" button[1], causing none of them to receive a significant numbers of upvotes. Could we have a feature in the "submit" dialog that displays similar stories in the last 24 hours and then asks the user if they really still want to submit theirs?
[1] https://new-hn.algolia.com/?experimental&sort=byDate&prefix=...