There's been an increase of one third in the number of secondary school students being cyberbullied.
The National Association of Principals and Deputy Principals carried out the research and found that only one-in-four parents monitor their children's activity online daily, while 15% admit to never checking.
The NAPD says young people might be afraid of losing their mobile phones if they report being cyberbullied.
Its Director Clive Byrne says young people should be taught how to interact online;
