“…The dimensions of engagement presented in the last section are helpful to framing the previous studies in engagement. There is an extensive body of work dealing with engagement in technology-mediated social participation systems (Kraut et al, 2010) such as wiki-based systems (Butler et al, 2002;Bryant et al, 2005;Butler et al, 2008;Schroer and Hertel, 2009;Preece and Shneiderman, 2009;Niederer and Van Dijck, 2010;Liu and Ram, 2011;Welser et al, 2011;Zhu et al, 2012), open source software projects (Hertel et al, 2003;Niederer and Van Dijck, 2010), and human computation for citizen science projects (Raddick et al, 2010;Rotman et al, 2012;López et al, 2012;Mao et al, 2013;Jennett et al, 2014).…”