Mobile phone aps and webcams are increasingly used to groom children for sex.
The NSPCCs Childline service fears more and more youngsters are becoming victims of on-line abuse.
It counselled Northern Ireland children 164 times last year, but given that a quarter of children didn't say where they were from the true figure is probably higher.
NSPCC's Karen Walker has talked to around 21 000 pupils at 190 County Antrim primary schools in the last five years:
High Court told Gerry Adams ‘major, major player in war!'
Natalie McNally murder accused ‘lied and lied again’
Woman dies in two-vehicle collision in Enniskillen
Little-Pengelly leads mission to showcase NI in Washington on St Patrick’s Day
Psychiatrists warn of ‘workforce crisis’ facing NI mental health services