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A: History of MathOverflow

Martin SleziakHistory of MathOverflow Milestones September 28, 2009: MathOverflow goes online October 10, 2009: MathOverflow is announced at the Secret Blogging Seminar December 2009 Greg Kuperberg became the first user to reach 10k reputation June 2010: featured in the AMS Notices. October 2010: 10000 users (...

I'd find practical to separate the list real events (first blah blah) to the (arbitrary) list of decimal records (10000000th occurrence of the letter E in a post, etc). — YCor 10 mins ago
@YCor As you can see, the answer is community wiki. So do not hesitate to edit it, if you have some ideas how it could/should be improved.
 

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