“…Most of them (e.g. Carell, 2006;Caspi et al, 2006;Caspi, Chajut & Saporta, 2008;Davies & Graf, 2005;Gao & Wong, 2008;Hesse & Giovis, 1997;Joyce & Kraut, 2006;de Laat et al, 2007;Wise et al, 2006) analyze communication by criteria such as number, length and regularity of messages, or media choice. More recent studies apply the social network analysis to online learning environments (de Laat et al, 2007).…”