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Why do some people answer in comments?
Is it in bad form to answer a question with another user's comment

I've started to see more and more people posting comments (under the question, not on another answer) which perfectly answer the question. Here's a recent example.

Is there a reason for this? Is it encouraged or discouraged? Would it be ethical to re-post it as an answer with reference to the original commenter?

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marked as duplicate by random Dec 20 '10 at 15:16

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.

    
@random That question only covers the general area of posting answers as comments. It doesn't cover either of the example case I provided nor the follow-on questions "Is it encouraged or discouraged? Would it be ethical to re-post it as an answer with reference to the original commenter?" –  marcog Dec 20 '10 at 15:21
    
You might be able to open the subquestions as a new question, reference the ones marked as "duplicates" and explain why they are not sufficient to answer the new question. I don't know if those would be closed too, but it's worth a shot. –  Mark Ransom Dec 20 '10 at 15:49

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up vote 1 down vote accepted

I answer with a comment when I'm not really sure I'm right, but want to offer a hunch. Often it's in cases where the relevant technologies are alien to me.

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While I partially agree in that case, the example I gave is quite a confident answer. –  marcog Dec 20 '10 at 15:13

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