https://meta.stackexchange.com/questions/118582/what-is-an-acceptable-answer explain when something should be written as answer, and when as a comment. On [this question][1], you can find this handy table. ![screenshot][2] Sometimes you will find answers written as comments; most of the times, that is because the user who wrote it is not sure; doesn't have the time to write a complete answer; thinks the question should be closed, but doesn't want to leave the OP without an answer; wants to leave a hint for somebody else to write an answer. In some cases, you will find a user who has gotten his answers down-voted writing a comment instead of writing an answer. Other times, users write a comment because they think that what they are saying is subjective, or they cannot back up what they are saying. What can be done with questions that are answered in comments is writing an answer with the content of that comment, possibly making the answer a Community Wiki, giving attribute to the user who wrote the comment (for example, saying "As [JLG][3] said in a comment […]."), and providing a link to the comment. (The last step is helpful if the comment is not visible because there are too much comments, or the user wrote more than one comment.) The reason low reputation users cannot write comments is avoiding they use comments for asking a new question or writing an answer; commenting on questions asked by other users is enabled when the users have used the site enough to understand when comments should be used. The measure of how much users used the site is the reputation. There is then a reason why users with a reputation of 1 cannot leave comments is avoiding comments are used to spam: Since questions are not bumped when comments are added, the only user noticing the comment would be the user who wrote the post. [1]: https://drupal.meta.stackexchange.com/questions/642/when-is-an-answer-more-suitable-as-comment-than-an-answer [2]: https://i.sstatic.net/oNdv0.png [3]: http://ell.stackexchange.com/users/457/jlg