The authors connect the teens’ technology use to the school environment and provide tools (including a companion website) for creating a positive school climate that counteracts cyberbullying and sexting. Contents: Teens, technology, and trouble -- School climate: where it begins and ends -- Adolescent mistreatment in the 21st century: an introduction to cyberbullying -- Adolescent relationships in the 21st century: an introduction to sexting -- School climate and online misbehaviors -- Strategies for improving your school climate -- It takes a village: social norms, bystanders, and peer mentoring -- Prevention through assessment: taking the pulse of your school and students -- Effective prevention requires effective response.