58% of children do not tell their parents when they are cyber bullied. Vicious, embarrassing, and hurtful messages from an anonymous attacker can be incredibly damaging to children, and in extreme cases can lead to murder or suicide. Despite the prevalence and seriousness of this danger, many parents are unaware of the situation until the problem has spiraled out of control.
Parents can help guide their children through the situation, and ensure the bullying does not lead to depression, retaliation, or more adverse effects.
Action Alert
http://www.myactionalert.com/dangers.aspx