If you are interested in the topic of cyberbullying and how the US government, and each state, is dealing with bullying and cyberbullying, the Cyberbullying Research Centre has a law fact sheet that is regularly updated on the topic.
This information can be of particular use to parents, to understand the rights of their children, and to schools on putting together their own bullying guidelines. Schools can, and have, been sued for punishing students when a legal bullying line has not been crossed; they've also been sued for not stepping in when said line was crossed.
So, this is a great resource to jump into to understand the situation. As always, you can find many great resources online about cyberbullying - for parents, educators, and for youth.