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They are boosted by people like me, who haven't seen it before. People on social media have this strange notion that we're all a perfect bloom filter. I don't have the time or energy to keep up with tens of thousands of posts per year, and new users are coming all the time. Reposts are inevitable.

A personalized bloom filter may be useful. That shouldn't be hard to implement in either JavaScript or Emacs Lisp.

Artificially boosted how?