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I cannot comment on answers other than mine, the link "Comment" is only visible for my answers.

Is it a matter of the reputation score (as "Downvoting" is)?

Thanks!

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Question answered: I needed 50 points =). Until today I had 45, and someone voted one of my answers and now I'm 55 =D. Thanks! – bloparod Apr 2 '10 at 2:02
    
    

If you mean on StackOverflow. Yes

On Meta you can comment on anything. On StackOverflow, SuperUser or Serverfault, you must have 50 reputation to comment.*

* Except on your own questions, your own answers, and any answers to questions you've asked. You can comment on your own "stuff" with 1 rep.

See the FAQ

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