Nathaniel Poor. What MMO Communities Don't Do: A Longitudinal Study of Guilds and Character Leveling, Or Not. In Meeyoung Cha, Cecilia Mascolo, Christian Sandvig, editors, Proceedings of the Ninth International Conference on Web and Social Media, ICWSM 2015, University of Oxford, Oxford, UK, May 26-29, 2015. pages 678-681, AAAI Press, 2015. [doi]