Youth around the world are fittingly described as digital natives because of their comfort and skill with technological hardware and content. Recent studies indicate that an overwhelming majority of children and teenagers use the Internet, cell phones, and other mobile devices. Equipped with familiarity and unprecedented access, it is no wonder that adolescents consume, create, and share copious amounts of content. But is there a cost?

Preface.- Acknowledgements.- About the Authors.- Adolescents' Digital Worlds: An Introduction.- Connecting Online Behavior to Adolescent Development: A Theoretical Framework.- Sexuality on the Internet: Sexual Exploration, Cybersex, and Pornography.- Constructing Identity Online: Identity Exploration and Self-presentation.- Intimacy and the Internet: Relationships with Friends, Romantic partners, and Family Members.- Digital Worlds and Doing the Right Thing: Morality, Ethics, and Civic Engagement.- Internet Use and Well Being: Physical and Psychological Effects.- Technology and Health: Using the Internet for Wellness and Illness.- When is it Too Much? Excessive Internet Use and Addictive Behavior.- The Darker Sides of the Internet: Violence, Cyber Bullying, and Victimization.- Promoting Positive and Safe Digital Worlds: What Parents and Teachers Can Do to Empower Youth.- Adolescents' Digital Worlds: Conclusions and Future Steps.