CEOP The Child Exploitation and Online Protection centre set up by the police is a fantastic resource to find out about e safety. They also has some great videos on you tube that open your eyes to the dangers of social networking, a few of which are below. It is worth looking at these yourselves, so that you too don't expose your family to hidden dangers that you do not know exist.
E safety for 5 to 7 year olds
Social Networking 8 - 10 Yrs Olds
Beware of sending pictures you would not show your mum 14 - 16 year olds