Becky Bowley, aged 15, launched a campaign on Twitter and YouTube against cyberbullying after she was victimised by her classmates.

The Thomas Hardye pupil said: “I had some problems with some people last year at school and the only people to talk to about it were adults.

“I felt like there was no one I could really turn to because I thought they wouldn’t really understand.

“I’ve put up videos on YouTube talking about my experience and then people can contact me through Twitter.

“I thought surely there are other people who have no one to turn to, hopefully I can be that person and let them know they’re not alone.”

Becky added: “I never put personal details up, like where I live or my full name or phone number.

“If someone tries to talk to me online I always double check who they are and see if any of my friends know them in real life.

“My security settings are always up high and I’m careful with what I message people.

“Unless you know someone in real life then you don’t really know them at all and they could be anyone.

“Never meet up with someone from the internet and always tell a friend or your family who you’re talking to online.”

Mum Brenda, said: “I’m more aware of the dangers because of Becky’s campaign.

“I do worry about her meeting people online. I think if you don’t know a person in real life you can’t guarantee that person is who they say they are.

“I think it’s mainly about keeping the lines of communication open and talking to your child.

“It’s important to keep an eye on them and keep asking what they’re up to and who they’re talking to.”

• A report by Ofcom found that around 20 per cent of eight to 15-year-olds with a social networking profile have it set to open.

A study by EU Kids Online found that 29 per cent of children in the UK have had contact with people over the internet who they had not met before.