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No, it's not possible for a user to see who has made thumbs up and thumbs down. There was an interesting discussion about thumbs down on Twitter the other day. Rand said (and I agree) that it does help minimize some flame wars, especially in the comments. Rather than a ton of people saying "that's stupid" or "I can't believe you said that", a thumbs down is a way of more politely expressing disagreement. I agree, it's never fun to see something you've written have a thumbs down and have no idea why.

thanks