Some children are clever in the way they bully. The don't have the courage to do it face to face, but it is so easy to do it anonymously online or by text. They can be very cruel, as I can testify.
I managed the school website. The rule was, no names with pictures, parents had to give permission for photographs to be published, any photos had to be taken at an angle. Those were the rules stated by the local authority.
There were families who had escaped a violent relationship, trying to start a new life and dared not allow pictures to be published online.
It is not paranoia, as some people have stated. Provocative pictures are also not the issue, as some posters seem to think. It is about seeing the wider picture and protecting children. If you had extensive training and experience in internet safety and child protection , you would understand why some of us are "paranoid" about posting pictures of children on social media.