Ask HN: What do people think of the idea of HN not showing already viewed links?

I made a chrome extension for myself that does this:

https://chrome.google.com/webstore/detail/hacker-news-saw-it...

Edit: Oops didn't really read your question. So this isn't exactly what you're looking for, but I still find it useful.

I've always thought that a better idea would be for HN to not permit an article already posted to be posted again until at least a week (preferably a month!) has passed.

I'm always annoyed to see the same article posted half a dozen times or so within the space of a day. That also splits up the comments so that most are never seen.

That's interesting. Could it be a chrome extension? I was thinking of a chrome extension that would hide links on either hn or lobste.rs depending on where you see it second.