Sending hurtful messages using mobiles and the internet is becoming more popular because it's quick, easy and difficult to trace.

Although cyber bullying is different from being pushed around in the playground, it can be just as upsetting.

Courtney, 14, was a victim of bullies in a chat room. Although her tormentors didn't try to hide their identity she never met them face-to -face.

Cyber bullying expert Wendy McAuliffe gave some tips on what to do if you're being bullied online or by text:

• You must make sure you keep all your personal details a secret
• Don't arrange to meet an internet friend in real life
• If someone is upsetting you online don't talk to them
• If you are getting bullied make sure you tell an adult