1. A computer-implemented method comprising: a processor 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 other users; the processor 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; the processor scoring a particular submission of said plurality of submissions automatically using the machine learning mechanism, thereby producing a score; the processor performing, relative to the particular submission, an action that is determined based on said score; and wherein performing said action comprises the processor performing at least one of: (a) storing, on a volatile or non-volatile computer-readable storage medium, data that indicates that the particular submission is inappropriate and (b) storing, on a volatile or non-volatile computer-readable storage medium, data that indicates that privileges of a submitter of the particular submission within the online answer submission system are limited, thereby limiting actions that the submitter of the particular submission can perform relative to the online answer submission system.