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by nine_k 3992 days ago
Sometimes you upvote a comment because you agree with it and consider it informative and correct — this is why you agree with it.

Sometimes you upvote a comment that you don't agree with but see it as genuinely informative or at least insightful.

What you don't is upvoting a comment which is not informative, or even misleading, but still conforming to your views.