You can find answers to the first question here: https://whaly.io/posts/hacker-news-2021-retrospective
And here: https://app.whaly.io/hacker-news/public/report/3596f39c-5a56...
Re:Top Hacker News commenters of 2021
by capableweb on Monday January 03, 2022 @07:31AM
(#29780110)
> There was 150k+ active users of Hacker News in 2021 and below is the list of the 10k most active users.[1]
- [1] https://whaly.io/posts/top-10k-commenters-of-hacker-news-in-...
More useful is knowing
* What were 2021's most upvoted articles?
* Wat were 20201's most upvoted comments?