“…For instance, existing measures assess positive emotions towards the group (Dragojevic & Giles, 2014;Wheeless, 1976), identification with the group (Doosje, Ellemers, & Spears, 1995;Leach et al, 2008;Wiley et al, 2013), and beliefs that the ingroup and outgroup should "stick together" (Glasford & Calcagno, 2012, Study 1). Other measures relate to various forms of support, such as prosocial attitudes towards the outgroup (Stavrova & Schlösser, 2015;Vollhardt et al, 2016), expressions of support for resolving the outgroup's cause (Cortland et al, 2017), empathic concern towards the outgroup (Papacostas, 2012), and collective action intentions to help address the outgroup's cause (Chayinska, Minescu, & McGarty, 2017;Dixon et al, 2017;Glasford & Calcagno, 2012, Study 2;Saab, Tausch, Spears, & Cheung, 2015;Subašić, Schmitt, & Reynolds, 2011). A notable exception to the uni-or bi-dimensional measurement of solidarity comes from Smith, McGarty, and Thomas (2018), who assessed Twitter users' solidarity with refugees by coding the proportion of their tweets that communicated pro-refugee sentiment, affiliation, loyalty, and collective action.…”