Ehh... I've learned to ignore cyber bullying. Back when I was in sixth grade, I knew a girl who said the most hateful and swear-filled messages and spammed me with them online, but when I confronted her IRL she chickened. If you are being cyber-bullied, disregard them as spambots.
Alternatively, you could drive them crazy with something else. Such as singing a random song. Very rarely can they do anything after that. The most is like "You're so retarded I don't have time for this" and they'll leave you alone. Consider mission accomplished.
