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Lin, G.Y. & Laffey, J.M. (2004). Effects of Different Activity Types and Time on Online Social Presence. In J. Nall & R. Robson (Eds.), Proceedings of E-Learn 2004--World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education (pp. 1996-2000). Washington, DC, USA: Association for the Advancement of Computing in Education (AACE).