Maria Cristina Matteucci Carlos Tomasetto Felice Carugati Patrizia Selleri Social Networks and Knowledge Construction Promotion in e-Learning Contexts. 2008 Knowledge Construction in E-learning Context http://ceur-ws.org/Vol-398/S1_MatteucciEtAl.pdf conf/socrates/2008kcec db/conf/socrates/kcec2008.html#MatteucciTCS08