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How do comments work?

I know it is a repetitive question, but I couldn't find the solution.

I can't leave a comment on any posts/questions on Stack Overflow, but I can leave a comment on Meta Stack Overflow.

Why?

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marked as duplicate by casperOne Sep 10 '12 at 0:12

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.

1  
    
Why I'm limited? – Behzad Sep 9 '12 at 23:41
    
@Behzad because you don't have 50 reputation. It is to prevent spam – Richard J. Ross III Sep 9 '12 at 23:45
    
thanks Mystical and Richard. Why I could leave a comment before but now not? – Behzad Sep 9 '12 at 23:46
    
@Behzad: Read the linked post. You can always comment on your own questions (and answers to them), just not on those of others. – David Robinson Sep 10 '12 at 3:17
up vote 2 down vote accepted

They are different sites, with different privilege levels, and your rep on them is independent. On meta you need 1 rep to comment on any post and you have 1 rep so you're good. On stackoverflow you need 1 rep to comment on posts in your questions, but you need 50 rep to comment on posts of someone else's questions and you have 37, so you're almost there.

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I could comment some month ago! those days I had fewer rep than now! – Behzad Sep 9 '12 at 23:50
    
you can comment on your own questions and answers regardless of your rep. Perhaps in the past you were commenting on your own posts. – Kate Gregory Sep 9 '12 at 23:51

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