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Re:Awesome Self-Reference by captn3m0 on Tuesday January 11, 2022 @01:53AM (#29888411)
HN post that upvoted itself: https://news.ycombinator.com/edit?id=3742902 (from 2012, before HN put CSRF protection in place).

There must be a self-linking post as well, but I can't find it

Re:Awesome Self-Reference by zizee on Tuesday January 11, 2022 @03:30AM (#29888992)
someone did this for a tweet as well...