alt Hacker NewsFWIW the only place I EVER see the phrase "citation needed" is on HN. That's not a good or a bad thing: it's simply an observation.
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analog31 • last Saturday at 3:22 PM
With apologies to the above post if I'm wrong, I've seen it as a polite way of saying, "bullshit."
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Pretty sure it originated with the Wikipedia annotation. See e.g. https://xkcd.com/285/ from 2007.