cyberbullying

/S AY1 B ER0 B UH1 L IY0 IH0 NG/
verb
  1. 1

    To bully online.

noun
  1. 1

    Acts in cyberspace intended to make life unpleasant for another person.

Source: https://en.wiktionary.org/wiki/cyberbully, https://en.wiktionary.org/wiki/cyberbullying