There has been some new updated guidance on Cyberbullying released by the Department for Education in the last week and it looks really useful. There is some new material and it is definitely worth a read for any parent and worth schools adding this document to their website.
It is a one stop place for support, especially with regards to reporting issues and has all the links for the various social media sites in one place and finally I really like that they have added the details of all the mobile phone providers and how to contact them to remove or block abusive and upsetting content.
You can access and download the guidance here