The ThinkUKnow website is the best place to get advice on 'online parenting'. It gives really useful advice about keeping safe online and comes recommended by the local Oxfordshire Safeguarding Children Board and the national organisation CEOP (Child Exploitation On Line Protection).
The Cyberbullying Research Center has a lot of great resources for educators, parents, and teens about how to deal with cyberbullying.
Net Aware is a site where parents review and rate social media apps and sites based on the features and how appropriate it is/isn't.
Students at Wood Green have all taken part in an e-safety assembly and receive guidance on internet safety through PSHE and ICT lessons. This Presentation contains useful information and links to other agencies concerned with safety over the internet.