The Sony hack revealed Mark Cuban's personal email address, as well as several confidential emails between himself and executives detailing his displeasure with a salary offered to him for ABC's hit show Shark Tank. On Sunday, the billionaire told CNN's Reliable Sources that prior to the hack, he had already stopped using email to conduct confidential business interactions and had instead moved to his app Cyber Dust, which he has described as "What's App meets SnapChat." Cuban was unequivocal about how the hack would affect Hollywood, which has been shocked by the hack, and if it would happen again.