It really depends on the type of cyberbullying. If the person is too aggressive, and a person suicides because of that, it is a crime. However, if he is just joking around with a friend, it should be overlooked. The problem with making this a federal crime, is because you don't know if they are really joking around or serious. And so while cyberbullying should be discouraged, i believe it isn't a large enough problem to become a federal crime
hope this helps