The author of a message on a Usenet newsgroup. It is the responsibility of the poster to ensure that the authored posts are on topic to the newsgroup in which they are posting in. The poster will also be responsible for ensuring that the posts made are free from spam and adds value to the topic the Usenet newsgroup is about. The reference to a poster can only be a positive. Otherwise, if the poster does not follow the practice and guidelines of the newsgroup moderator, they, as well as the posts are considered to be a spammer or abuser. A poster is one who is known to contribute to the newsgroup as opposed to a reader or lecher.