Children have the right to be protected from being hurt and mistreated, physically or mentally, they have a right to privacy. We all share a collective responsibility to guarantee these rights are enforced and enable children and young people to play, learn, develop, and participate, both offline and online.

Parents: Teach your kids empathy and talk with them about their online activities.
Teachers: Help kids understand the line between funny and cruel and develop an antibullying charter/program in your school.
Kids: If you witness cyberbullying, report it and offer your support.

Peer cruelty happens at all ages.  Parents need to keep in mind, while they monitoring their children, their kids will be snooping on them.   Mom and dad need to be conscience of what they are posting in social media also.  You are a social media role model.

Lead by example.