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Possible Duplicate:
How do comment voting and flagging work?

How do I upvote or downvote comments?

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You can up-vote comments by clicking the up arrow right next to them (you have to hover over the comment to see the arrow).
Down-voting of comments is not possible.

Also: this might be interesting:

https://stackoverflow.com/questions/755319/how-does-comment-voting-work

  • I see that now, after I got some rep points. Thanks – Varma Jul 7 '09 at 10:26
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You probably need a bit of rep to vote on comments too.

you do to vote on questions. https://stackoverflow.com/faq

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    Specifically, you need 15+ rep to vote on comments (the same as being able to upvote questions and answers). – MrWhite Jan 10 '19 at 11:08

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