This is the advice of senior constable Deryck Rivers, NSW Police South West Region school liaison officer from Campbelltown.

Senior constable Rivers, who speaks regularly at high schools in the area, has been warning parents and students of the dangers of revealing personal information on social networking sites, the internet and mobile phones.

He said cyber-bullying was a growing concern for parents and teachers and his presentations explained cyber crime, its consequences and ways parents could protect children from falling victim.

``Parents aren't as computer savvy as their kids but they have to be so they can teach young people how to be responsible with digital technology,'' he said.

``Cyber-bullying is symptomatic of the generation young people are in and they haven't been taught to be aware of their consequences.

``I press the point to them that every online action has an offline consequence.''

Senior constable Rivers said his number one tip to parents was to ``become computer savvy''. ``Learn the basics because you need to monitor what your children are doing online and warn them that personal information needs to kept private,'' he said.

Senior constable Rivers recommended websites like thinkuknow.

org.au and netalert.gov.au for advice on internet safety. Hear his presentation on cyber-bullying and cyber crime at Macarthur Anglican School on September1 at 7.30pm.

Details, bookings: 46475333.