1. Fels, D.I. and Weiss, P.L. (2000) ‘Toward determining an attention-getting device for improving video-mediated communication’, Computers in Human Behavior, 16(2): 189–98.
2. Hsieh, Y.P. (2012) ‘Online social networking skills: the social affordances approach to digital inequality’, First Monday, 17(4), at http://firstmonday.org /ojs/index.php/fm/article/view/3893.
3. Scardamalia, M. and Bereiter, C. (2003) ‘Knowledge building’, In J.W. Guthrie (ed.), Encyclopedia of Education, New York: Macmillan, pp. 1370–3.
4. Buder, J. (2007) ‘Net-based knowledge communication in groups: searching for added value’, Zeitschrift für Psychologie, 215(4): 209–17.
5. Ibid.