For example, this question. You can add answers to it, but there is no "add a comment" link on the question or any of its answers. Does this mean we're supposed to "shut up and answer it already?" Or is additional Reputation required to comment?
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Commenting on other people's posts requires a reputation of 50, read more about it here. As you have already noticed you can always comment on your own questions.
answered Jun 24 '12 at 17:48
