Journal of a Schoolyard Bully: Cyber Bully by Farley Katz
After his mum transfers jobs and towns, Niko Kayler, notorious calculating bully, gets a second chance to be good, or be evil. Though he tries to contain himself, Niko stumbles onto the world of cyber bullying, harnessing the power of mobiles, Facebook, and some technology he invents to covertly torture his fellow classmates. Things seem to be going well for Niko until the technology is turned against him and Niko learns what it's like to be on the wrong side of the cyber bullying.