I think people who use the computer to say unkind things are usually cowards. They use the computer to say these unkind things because they are scared to say it in public. The computer may be an escape for cyber-bullies.It is best to ignore cyber threats. Otherwise report it to an trusted adult.
If someone said something i didn't like to me on the computer, or telephone, i would be very offended and would find away to solve my problem. The easier the problem is solved then the easier it will be to forget and move on. There is reason to hold an internet grudge against someone. You will eventually have to face that person in public.
There is really no difference between the computer and a telephone. They are both very different way of communication, that can still be used for bullying. In many cases the telephone, and the computer are still ways to communicate with people and are still very dangerous ways of Stalking.