Paedophiles use secret Facebook groups to swap images
A BBC investigation has found that paedophiles are using secret groups on Facebook to groom children and exchange obscene images.
Online settings mean these groups are invisible to ordinary users, only members can see what's inside.
The Children's Commissioner for England says the company is not doing enough to protect children by policing the groups.
Facebook has now agreed to investigate.
Angus Crawford has this special investigation.