I want a related-comments tool, so that when anyone posts a comment on a story about Tesla Autopilot or nuclear energy, they can see links to the 10,000 unoriginal comments mirroring what they wrote (again).
There's something to that idea, because the art of optimizing a site for curiosity has mostly to do with avoiding repetition, and the most repetitive comments ought to be the most machine-learnable.
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...