Maartje Boer

Chapter 1 Introduction	7
Chapter 2 Validation of the Social Media Disorder-Scale in adolescents: Findings from a large-scale nationally representative sample	25
Chapter 3 Cross-national validation of the Social Media Disorder-Scale: Findings from adolescents from 44 countries	57
Chapter 4 Adolescents' intense and problematic social media use and their well-being in 29 countries	101
Chapter 5 Attention deficit hyperactivity disorder-symptoms, social media use intensity, and social media use problems in adolescents: Investigating directionality	127
Chapter 6 Social media use intensity, social media use problems, and mental health among adolescents: Investigating directionality and mediating processes	153
Chapter 7 The course of problematic social media use in young adolescents: A latent class growth analysis	191
Chapter 8 The complex association between social media use intensity and adolescent wellbeing: A longitudinal investigation of five factors that may affect the association	231
Chapter 9 Summary and discussion	285
Samenvatting [Summary in Dutch]	317
References	333
Dankwoord [Acknowledgements]	361
Curriculum Vitae	369

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