Spot the Drowning Child - https://news.ycombinator.com/item?id=26122952 - Feb 2021 (1 comment)
Spot the Drowning Child (2015) - https://news.ycombinator.com/item?id=22482731 - March 2020 (405 comments)
Show HN: Spot the Drowning Child - https://news.ycombinator.com/item?id=9962185 - July 2015 (378 comments)
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Btw, on a couple other points:
> also OP posted same link 2 days ago
It was the same link; it just got picked for the second-chance pool (https://news.ycombinator.com/pool, explained at https://news.ycombinator.com/item?id=26998308), so it got a random placement on HN's front page.
> sufficient conversation
Reposts are fine on HN after a year or so! This is in the FAQ: https://news.ycombinator.com/newsfaq.html.