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There are a number of dead posts in this thread. I'd post some here (some of which don't appear to violate any HN guidelines, I'll note), but probably those same moderators would kill this one, too.
[Flagged] means it was killed by a moderator. Those are more rare. I don't agree with everything that is flagged but I think HN has a great moderation policy overall. Often when posts are flagged, the moderator responds explaining why.
Comments that are marked [dead] without the [flagged] indicator are because the user that posted the comment has been banned. For green (new) accounts this can be due to automatic filters that threw up false positives for new accounts. For old accounts this shows that the account has been banned by moderators. Users who have been banned can email hn@ycombinator.com pledging to follow the rules in the future and they'll be granted another chance. Even if a user remains banned, you can unhide a good [dead] comment by clicking on its timestamp and clicking "vouch."
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