Pupils are being warned about the potential dangers of paedophiles surfing the internet, in school sessions run by police.
Avon and Somerset Police say they are worried students who set up their own web sites are giving away too many personal details.
The sessions are being run in a pilot project at Backwell School.
Pc Andy Bibbings said: "Computers are useful tools. But there is a sinister side which people have to be aware of."
"This is about how much personal information you release," he added.