Book excerpt: Adolescents and young adults are the main users of social media. This has sparked interest among researchers regarding the effects of social media on normative development. There exists a need for an edited collection that will provide readers with both breadth and depth on the impacts of social media on normative development and social media as an amplifier of positive and negative behaviors. The Psychology and Dynamics Behind Social Media Interactions is an essential reference book that focuses on current social media research and provides insight into the benefits and detriments of social media through the lens of psychological theories. It enhances the understanding of current research regarding the antecedents to social media use and problematic use, effects of use for identity formation, mental and physical health, and relationships (friendships and romantic and family relationships) in addition to implications for education and support groups. Intended to aid in collaborative research opportunities, this book is ideal for clinicians, educators, researchers, councilors, psychologists, and social workers.