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Re:‘OK Boomer’ Marks the End of Friendly Generational Relations by daxelrod on Monday November 04, 2019 @09:25AM (#21441876)
October 15 of what year?

https://knowyourmeme.com/memes/ok-boomer identifies it being used on Twitter as early as April 2018, with a surge in popularity in Jan 2019.

Re:‘OK Boomer’ Marks the End of Friendly Generational Relations by bredren on Monday November 04, 2019 @11:58AM (#21443599)
The article is about TikTok, so my comment was focused on its first appearance there that I noticed.