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Once your karma passes a certain threshold, you will gain the ability to downvote comments.

• jcl 18y ago
  Also, it seems you can't downvote replies to your own posts, or downvote anything older than a day or so.
  • astine 18y ago
    That, I imagine is to prevent revenge down-voting. It seems like a good idea to me.
    • unalone 18y ago
      Yep. It also occasionally locks out posts by a user in the same thread as the one in which they reply to you. Same anti-revenge idea, as far as I can see.