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How do comments work?

OK, when I am on the main site, why am I not able to comment on a question?

See http://i39.tinypic.com/htz4lx.jpg (I chose a random new question, nothing special).

I had to name it a certain tag in order to post this so I picked support. I hope it's OK, but the comments, I believe, are correct.

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marked as duplicate by animuson, jonsca, casperOne Jan 21 '12 at 3:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Surprised no one has mentioned that this feature is counterintuitive. So another user posts an issue, and a solution is offered, which they accept and upvote. I have a clarification to add to the solution, basically to say "you can do this, but sometimes you should do this other thing" WHY do i need rep to make that statement? It should be deletable by the original author, right? or at least Downvote-able? but why make me ask enough questions on this site just to accrue rep if all i want to do is add content to an existing post? – MrLoggins Mar 12 '13 at 19:35

You need 50 reputation to comment on other people's questions and the corresponding answers.

From Privileges - Comment Everywhere - Stack Overflow:

Please note that you can always comment on your own posts, and any part of your questions. However, commenting on other people's posts is a privilege.

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5  
While this is true, his screen-shot makes me think he is also logged out. I think those Yes/No boxes only appear to anonymous users (not logged in) because they can't vote up/down. – animuson Jan 21 '12 at 3:21
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He currently has 1 rep. – casperOne Jan 21 '12 at 3:48
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I was logged in – Smarty57 Jan 21 '12 at 3:53
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This is very bad this that new people can not answer – Mindaugas Milius Aug 13 '13 at 12:58
    
@MindaugasMilius: New users can post answers; they just cannot post comments. – Dennis Aug 13 '13 at 13:42

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