Nebu comments on Why Our Kind Can't Cooperate - Less Wrong
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Comments (186)
The nice thing about karma/voting sites like this one is that they provide an efficient and socially acceptable mechanism for signaling agreement: just hit the upmod button. Nobody wants to read or listen to page after page of "me too"; forcing people to tolerate this would be bad enough to negate the advantage of making agreement visible. Voting accomplishes the same visibility without the irritating side-effects.
There's a bit of noise, as I sometimes vote up someone I disagree with if they raise an interesting point, and I very, very rarely vote someone down just because I disagree with them.
This "bit of noise" becomes significant on sites with a small number of subscribers, as a +/-2 vote is a "big deal".
I think that's a feature, not a bug. What an upvote expresses is nearer to "you should listen to this guy" than to "I agree with this guy", but I think the former is more useful information.