“…Initiating; asking questions; commenting and replying; verbosity; information sharing; linking; popularity; volume Seeker Learner, retriever (Reinhardt et al, 2011); knowledge user (Helms and Buijsrogge, 2005) Problem-solving (ask); social praise (provide) Knowledge seeker (Beck et al, 2014); question asker (Fisher et al, 2006;Viegas and Smith, 2004) Initiating; asking questions; commenting and replying; thanking; linking; popularity Helper Helper, solver (Reinhardt et al, 2011); knowledge creator (Helms and Buijsrogge, 2005) Problem-solving (provide) Value-adding user (Berger et al, 2014); knowledge contributor (Beck et al, 2014); answer person (Fisher et al, 2006;Viegas and Smith, 2004); giver (Cetto et al, 2016) Commenting and replying; information sharing; linking; volume; verbosity; regularity; quality Expert Helper, solver (Reinhardt et al, 2011) Problem-solving (provide) (mixed/distributed) expert (Rowe et al, 2013); elitist (Chan et al, 2010) Commenting and replying; information sharing; linking; popularity; focus dispersion; verbosity; volume; reciprocity; quality Networker Networker (Reinhardt et al, 2011) Status updates (provide); problem-solving (provide); discussion and opinion (provide); informal talk (provide)…”