Is it possible for bullying to lead to mental illness?

Tonight's episode is a previously recorded show on bullying and mental illness. The guest was a victim of bullying and as a result he developed a mental illness. He is now a spokesperson travelling all over the world speaking out against bulying. He has written several books on the topic. Bullying is not what it used to be. The newest form of bullying is cyberbulling. Have you ever been bullied? Do you know someone who was bullied? Were you a bully?