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Re:Ask HN: What is with the new URLs on facebook.com? by bencollier49 on Saturday July 16, 2022 @05:32PM (#32122179)
They literally just announced they were doing it.

https://gizmodo.com/firefox-update-stop-url-tracking-chrome-...

Re:Ask HN: What is with the new URLs on facebook.com? by tedmiston on Saturday July 16, 2022 @07:06PM (#32122759)
That's the old encoding (fbclid), not the new one (pfbid).