Someone who is pleasant and reasonable in person, but becomes terribly annoying, and even downright loathesome in e-mailed correspondence.
Gary was very understanding during our meeting this morning, but when we checked our e-mails later that day, it was clear we were dealing with a real cyberbitch.
Person who reads news, sports events social websites or other internet media and is compelled to comment negatively, hoping to invoke a reaction. These individuals are addicted to this faceless controversy and are constantly checking websites, email, etc. looking for a response to their opinion. A real divorce maker....just sayin'.