Peter Sitzer, Bielefeld University (image) Bielefeld University Caption "Cyberbullying is not a trivial matter," says Peter Sitzer of Bielefeld University. Sitzer and his colleagues have investigated the experiences of adolescents with attacks through the Internet or by mobile phone. Credit Bielefeld University Usage Restrictions The image may only be used with appropriate caption or credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.