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Re:New Hacker News Guideline: Avoid Gratuitous Negativity by prawn on Friday April 03, 2015 @06:45PM (#9319031)
pg a few years back commented: I think it's ok to use the up and down arrows to express agreement. Obviously the uparrows aren't only for applauding politeness, so it seems reasonable that the downarrows aren't only for booing rudeness.

https://news.ycombinator.com/item?id=117171

I don't know if he's made another comment on this issue since then.

Shouldn't flagging a post/topic be generally used for a guideline violation?

Re:New Hacker News Guideline: Avoid Gratuitous Negativity by dang on Friday April 03, 2015 @07:32PM (#9319207)
> Shouldn't flagging a post/topic be generally used for a guideline violation?

Yes.

Re:New Hacker News Guideline: Avoid Gratuitous Negativity by dragonwriter on Friday April 03, 2015 @10:38PM (#9319694)
As I understand it, flagging should be used for egregious violations of the guidelines, but borderline or minor violations, simple lack of substance, or (per pg's comment) perhaps even mere disagreement are suitable uses for downvotes.