The following websites may provide a useful starting point in discussions with your children around the very relevant and important subject of e-safety:
http://www.childnet.com/parents-and-carers/hot-topics
http://www.saferinternet.org.uk/
http://www.bbc.co.uk/newsround/13908828
http://www.youtube.com/user/ceop
Keeping children safe online | NSPCC