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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.