Book excerpt: Handbook of Social Media in Education, Consumer Behavior and Politics explores the impact of social media within these systems. The book covers who contributes to social media, from social influencers to everyday people, how that information is disseminated in shares and likes, and the impact social media has on perception, opinion and behavior. Education coverage includes influences on pedagogy, class participation, e-learning, academic performance, and it's use and influence on teachers, parents and students. Coverage in economics and commercialization includes different types of digital marketing and social media, the rise of social influencers, and impacts on consumer behavior. Coverage in politics includes the impact on political awareness, participation and its impact on election outcomes. Coverage on design and innovation includes the design of social media and tools and approaches for maximizing impact. - Reviews the economic impacts of social media, including social media influencers and digital marketing - Explores teacher, student and parental use of social media in K-12 education - Discusses how social media impacts elections and political awareness - Investigates the tools and approaches for impacting social change in a social media world