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anarki
Community-managed fork of the Arc dialect of Lisp; for commit privileges submit a pull request.
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It was published in the public version of 2009 https://github.com/arclanguage/anarki/blob/9f2e1dd53b5b66bb4... Look for "contro-factor" (i.e. controversial-factor).
This is old code, and the mods make tweaks here and there without warning, so the details may have changed. (I'm not sure if gravity changed from 1.8 to 1.6 (???).)
I didn't test it personally, but it feels like HN is using something very similar. And there are a few black box analysis of the sorting of the front page that got similar results. Also, minimaxir is the kind of person that is probably running an script to use the HN API to verify the claims.