the folks over at google have started a portal for information and mechanisms to help teach and become aware of internet abuse and safety issues.
you might find this helpful in conversing with parents about what to expect and the why’s of growing user generated communal life on the internet. it can be abusive and loving. generally the misconception is that it is unsafe, it can be, but with general precautions it can be safe for users.
visit the abuse and safety help center