| 1) Social media usage by politicians (in context) | a) Politicians’ cross-media presence | Blach-Ørsten et al., 2017; Hong & Nadler, 2012; Kovic et al., 2017; Kruikemeier et al., 2018; Neihouser & Ouellet, 2022; Van Aelst et al., 2017 |
| b) Variations in the communicative content across different media | Bode et al., 2016; Borah et al., 2018; Filimonov et al., 2016; Fowler et al., 2021; Kang et al., 2018; Karlsen & Enjolras, 2016; Mendes & Dikwal-Bot, 2022; Skovsgaard & van Dalen, 2013; Steffan & Venema, 2020; van Dalen et al., 2015 |
| c) Perceived importance and role of social media in politicians’ broader strategies | Bor, 2014; D’heer, 2018; Enli & Skogerbø, 2013; Giasson et al., 2019; Guðmundsson, 2016, 2019; Guðmundsson et al., 2019; Jungherr, 2016a; Klinger & Russmann, 2017; Kreiss & McGregor, 2022; Larsson & Skogerbø, 2018; Lilleker et al., 2015; Magin et al., 2017; McGregor, 2020; Paatelainen et al., 2022; Park & Suiter, 2021 |
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| 2) Variations in politicians’ social and traditional media usage | a) Equalisation versus normalisation | Bode et al., 2016; Fowler et al., 2021; Guðmundsson, 2016, 2019; Kruikemeier et al., 2018; Neihouser & Ouellet, 2022; Skovsgaard & van Dalen, 2013; Steffan & Venema, 2020; Van Aelst et al., 2017 |
| b) Social media in populist communication | Casero-Ripollés et al., 2016; de Vreese et al., 2018; Ernst et al., 2019; Gil de Zúñiga et al., 2020; Postill, 2018; Suiter et al., 2018 |
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| 3) Broader effects of the emergence of social media in politics | a) Effects on the political output (i.e., how politics and political communication is conducted) | Chadwick & Stromer-Galley, 2016; D’heer, 2018; Fisher et al., 2018; Giasson et al., 2019; Grusell & Nord, 2020; Guðmundsson et al., 2019; Jost, 2022; Jungherr et al., 2020; Laube, 2020; Ridge-Newman, 2020; Schäfer, 2021; Serazio, 2015; Vaccari, 2010 |
| b) Effects on the political outcome (i.e., on political support, electoral results, etc.) | Blach-Ørsten et al., 2017; Borah et al., 2018; Hong & Nadler, 2012; Karlsen & Enjolras, 2016; Kovic et al., 2017; Van Aelst et al., 2017 |
