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My question about buttons was about this also. Is there a dupe button? How do posts get the [dupe] label if not? Is it manually applied after people generically

• anigbrowl 4y ago
  Normally if you submit the same link as someone else it will be automatically flagged as a duplicate, and you'll get a link to the original post. This works well most of the time, which is why I was surprised that individual tweets (with their very specific URLs) didn't set it off. The duplication filter is run by HN rather than user flags. Most of the time it's effective, although if someone posts an interesting story at the wrong time of day and it dies for lack of attention the dupe filter can defeat subsequent efforts by people to repost it. However it's easy to circumvent by modifying the submission URL, just don't abuse it.