[_asummers]

One place a tool like this would be useful is on submission. If I post a link and something comes up that says "HEY! This was last posted 2 days ago and got 300 upvotes and had 45 comments, here's the link.", that would discourage reposting when the poster didn't know the article had been posted before.

[carrotleads]

HN does this but only when the link is same...

you can have people post similar stories from different media's and if they get picked at different times then this could be useful.

[eli]

I thought it already did that.

[_asummers]

Oh, maybe. I guess I've never submitted a link before to know that. Even still, if that algorithm can be improved, even slightly, it'd be better for curbing repeat posts.