I've already stated this, and I'll say it again. These large social networking sites are constantly monitored by staff members.
2) Parents and Schools exist for reasons. Those who get cyber-bullied, just like those who get bullied in real life, can simply go to their parents or to their school.
3)Most people on social networking sites are adults who are capable of making their own choices as to what to do.
4)People are responsible when it comes to who their friends are, and taking it up with the proper people if they are being cyber-bullied on social networks. Nowadays, most schools are open to help children who are being cyber-bullied.