Like traditional bullying, there are warning signs for teachers to watch for in their students. These signs can help you identify a victim or a cyberbully and step into the situation. Cyberbullying can be quite harmful to the well-being of students if it goes unchecked. In addition, the negative effects on students can severely damage your ability to manage the classroom.
http://www.theedadvocate.org/14-signs-cyberbullying-classroom/