From Gunnar Sommerfeldt, who publishes the Frontman Project, a site featuring articles on a wide array of topics including politics and foreign affairs:

"Cyber bullying" is a term that many young people will recognize. The schoolyard bully has moved from pushing people around in the schoolyard to making his or her threats online, often assisted by high-tech gadgets. Younger and younger kids are being equipped with cell phones, PDAs and similar equipment, and rather than using these new tools as they were intended, they treat them as a means of enforcing their own laws on other kids.

Threatening text messages, pictures posted illegally online, bulletin board messages and the like have become favored tools of the new tech generation. Privacy laws and social expectations are often disregarded by the underage perpetrators in order to force their point and gain respect and status in their environment -- this is a growing concern for experts on school bullying and teenage violence.

The main issue is that the online bullying often extends beyond the screen and transplants itself into real life, with either direct physical violence or psychological implications on the victim.