User blog comment:NeonSpotlight/Where did comments go?/@comment-4834593-20120808083836/@comment-1915726-20120808090805

No. 1) I don't think our commenting engine support voting on comment. 2) Even if we had this option available, unless we had required user to login to vote, it would be likely abused by trolls to outvote the comment they liked/disliked.