Less than one in five parents supervises their children's use of social media.

Research released today by the National Anti-Bullying Centre at DCU, has found over half of parents don't know how to block inappropriate web content.

The survey also shows that while most parents use Facebook, they're unfamiliar with networks used by children, like snap chat.

Dr James O'Higgins of the National Anti-Bullying Research and Resource Centre says it is vital parents get to know where their kids are "hanging out" online: