Hey HN, what does [flagged] mean? Did I do something wrong when posting this? It's the first time I see it here.
Here's the FAQ entry
https://news.ycombinator.com/newsfaq.html
What does [flagged] mean?
Users flagged the post as breaking the guidelines or otherwise not belonging on HN.
Moderators sometimes also add [flagged] (though not usually on submissions), and sometimes turn flags off when they are unfair.
A bit harsh maybe, but gotta agree to the rules to play the game :)