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Some Users Pack a Wallop: Measuring the Impact of Core Users on the Participation of Others in Online Social Systems., , , and . ICWSM, The AAAI Press, (2008)A Conceptual and Operational Definition of 'Social Role' in Online Community., , , and . HICSS, page 1-11. IEEE Computer Society, (2009)Finding social roles in Wikipedia., , , , , , and . iConference, page 122-129. ACM, (2011)Digital inequality in the Appalachian Ohio: Understanding how demographics, internet access, and skills can shape vital information use (VIU)., , , , and . Telematics Informatics, (2020)Distinguishing Knowledge vs Social Capital in Social Media with Roles and Context., , , and . ICWSM, The AAAI Press, (2009)You Are Who You Talk To: Detecting Roles in Usenet Newsgroups., , and . HICSS, IEEE Computer Society, (2006)'The internet is here': emergent coordination and innovation of protest forms in digital culture., and . iConference, page 304-311. ACM, (2011)Picturing Usenet: Mapping Computer-Mediated Collective Action., , , and . J. Comput. Mediat. Commun., (2005)Whither the Experts? Social Affordances and the Cultivation of Experts in Community Q&A Systems., , , , and . CSE (4), page 450-455. IEEE Computer Society, (2009)Visualizing the Signatures of Social Roles in Online Discussion Groups., , , and . J. Soc. Struct., (2007)