The field of the invention relates to systems and methods for managing user behavior in online multiuser systems, and more particularly to systems and methods that provide user-based arbitration for online multiuser systems. In one embodiment, a multi-user online system enables a first user to report a second user's behavior while online. The system receives the report and merges the report with the second user's recorded interactions with the online system related to the report to create an arbitration file. The arbitration file is then made available to a third user to review the arbitration file and determine whether action is warranted.