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I suggest adding one more guideline - before submitting a post, check to see if it has already been submitted.

Last I checked, identical URLs are automatically prevented. But the duplication becomes a problem when people decide to submit blog posts, etc. instead of original articles. There is (usually) only one "best" URL for a story.

Also an issue when people submit the "printer-friendly version" and also the ordinary version.

Proposed guideline: submit the "printer-friendly" version?

and/or have hacker news auto-flag the printer friendly / non-printer friendly version where it's possible to do so, could be an idea too. :)

How does HN handle URL with parameters?

e.g.

http://example.com/2009/23137321.html?from=rss

http://example.com/2009/23137321.html

They are basically both the same article.

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