Why do people get worked up over these hoaxes? Johnny Depp isn’t dead. Let’s all relax. This was a hoax from years ago that was re-released somehow today, and it just blew up in the Twitter-sphere. That is the scary thing about social media; the fire spreads almost too quickly on rumors. Crazy that people may wake up only to find this rumor disappeared.
An overnight sensation would be the right word to use.