Hacker News Reader

Perfectly sane reason for not signing up with Twitter.

I want to downvote the person you replied to and upvote your comment. HN apparently doesn't work like that so I'll stick with a single upvote :)

Once you get enough karma you can downvote comments.

But the delay is specifically so you can internalise the fact that downvoting here is a stronger claim than on, say, reddit.