Green M Next to Names?
I have noticed that certain usernames have green M's beside them. What do these mean?
The M signifies that a user is a moderator (previously a green circle with a star). Moderators are volunteers who were selected among helpful community members. Their special status helps them stand out and they are also able to delete comments that are not in agreement with the community guidelines http://www.duolingo.com/#/guidelines. Here is the original discussion about moderators: www.duolingo.com/#/comment/304702