The Professionals Online Safety Helpline (POSH), part of the UK Safer Internet Centre, is for professionals and volunteers who work with children and young people.
CBBC presenters sing about how to stay safe online. Watch the video.
Video showing how hurtful comments are when broadcast to everyone who knows the victim.
A useful video showing howhurtful online comments are when said face to face.
Services such as LivesOn and DeadSocial plan to keep your friends and family updated on your Twitter and Facebook pages, even after you have passed away. More on The Guardian website