Cyberbullying studies

Cyberbullying studies quantify growing problem
As many as one in three, or as few as one in 10, U.S. children are bullied online. About 17% of early adolescents are still victims of in-person bullying, while 64% of cybervictims were not harassed in person.
David-Ferdon, C., & Hertz, M. (2007, Dec.). Youth Violence and Electronic Media: Similar Behaviors, Different Venues? Journal of Adolescent Health, 41(6). Supplement 1, A1-A4, S1-S68.