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I came across this question on Stack Overflow: What is difference between const and non const key?, which has one comment by user Soerium. I hovered over his name link and saw that he has just the 1 rep.

In the privilege page, Comment Everywhere privileges require 50 rep. Soerium is not OP of question.

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marked as duplicate by hims056, NullPoiиteя, Mat, Antony, Aziz Shaikh Jul 15 '13 at 7:23

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.

You have already asked this question before: User was able to leave a comment without having the required privilege. – hims056 Jul 15 '13 at 7:14
.. i just forget it ..:( now it looks i should stop contributing on meta ... :( – NullPoiиteя Jul 15 '13 at 7:17
up vote 1 down vote accepted

I assume that user has answer a question which was flagged by other users ( as NAA ). While handling the flag moderator has converted his/her answer to the comment ( if it is useful answer ).

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If a user (mostly new) posts link only answer then it is automatically converted to comment. This looks the same case.

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