[[File:Affordnce in communication media - Clarck and brennan -1991.gif|600px|center|thumb|Taken from Ianfoli Iandoli et al 2012<ref>Iandoli, L., Quinto, I., De Liddo, A., & Shum, S. B. (2012). A debate dashboard to enhance online knowledge sharing. VINE, 42(1), 67–93.</ref>]]