Raffaella Grieco Delfina Malandrino Giuseppina Palmieri Vittorio Scarano Face2face social bookmarking with recommendations: WebQuests in the classrooms. 223-232 2007 CollaborateCom http://dx.doi.org/10.1109/COLCOM.2007.4553834 conf/colcom/2007 db/conf/colcom/colcom2007.html#GriecoMPS07