13. A non-transitory volatile or non-volatile computer-readable medium that stores instructions which, when executed by one or more processors, cause the one or more processors to perform steps comprising: receiving one or more answer submissions at an online answer submission system that accepts, from multiple users, answers to questions submitted to the online answer submission system by users other than those that submitted the one or more answer submissions; processing a set of previously scored training submissions, thereby training a machine learning mechanism to score, automatically, a plurality of submissions that are submitted by users of a system; scoring a particular submission of said plurality of submissions automatically using the machine learning mechanism, thereby producing a score; and performing, relative to the particular submission, an action that is determined based on said score; wherein said previously scored training submissions are also answers to questions submitted to the online answer submission system.
13. A non-transitory volatile or non-volatile computer-readable medium that stores instructions which, when executed by one or more processors, cause the one or more processors to perform steps comprising: receiving one or more answer submissions at an online answer submission system that accepts, from multiple users, answers to questions submitted to the online answer submission system by users other than those that submitted the one or more answer submissions; processing a set of previously scored training submissions, thereby training a machine learning mechanism to score, automatically, a plurality of submissions that are submitted by users of a system; scoring a particular submission of said plurality of submissions automatically using the machine learning mechanism, thereby producing a score; and performing, relative to the particular submission, an action that is determined based on said score; wherein said previously scored training submissions are also answers to questions submitted to the online answer submission system. 14. The computer-readable medium of claim 13 , wherein processing the set of previously scored training submissions comprises automatically identifying, in the previously scored training submissions, co-occurrences of words that are correlated with the scores that one or more of the previously scored training submissions received.