Appendix A1.

Themes and corresponding papers.

Self-expression, judgement, validation	Appearance anxiety and body ideals	Addiction	Connection and support	Dangers of social media
Kennedy & Lynch (2016)	Berne et al. (2014)	Smahel et al. (2015)	Weinstein & Selman (2014)	Berne et al. (2014)
Singleton et al. (2016)	Burnette et al. (2017)	Kennedy & Lynch (2016)	Best et al. (2015)	Weinstein & Selman (2014)
Calancie et al. (2017)	Radovic et al. (2017)	Singleton et al. (2016)	Kendal et al. (2017)	Smahel et al. (2015)
Burnette et al. (2017)	O’Reilly, Dogra, Whiteman, et al. (2018)	Thomas et al. (2016)	Fergie et al. (2016)	Singleton et al. (2016)
Radovic et al. (2017)	Boursier et al. (2020)	Calancie et al. (2017)	Kennedy & Lynch (2016)	Calancie et al. (2017)
Weinstein (2018)	O’Reilly (2020)	Mulisa & Getahun (2018)	Singleton et al. (2016)	Radovic et al. (2017)
		O’Reilly, Dogra, Whiteman, et al. (2018)	Thomas et al. (2016)	Smith et al. (2017)
		Scott et al. (2019)	Calancie et al. (2017)	Mulisa & Getahun (2018)
		O’Reilly (2020)	Naslund et al. (2017)	O’Reilly et al. (2018)
			Radovic et al. (2017)	Weinstein (2018)
			Aragao et al. (2018)	Wang et al. (2019)
			Mulisa & Getahun (2018)	O’Reilly (2020)
			O’Reilly, Dogra, Hughes et al., 2018
			Weinstein (2018)
			Nikolaou et al. (2019)
			O’Reilly (2020)