Evan Spiegel

A lawsuit over its ownership, controversial emails dredged up from the past, a spurned $3 billion offer from Facebook: the ephemeral-messaging app Spiegel co-founded has grown to a reported 100 million monthly users– and it has all the fixin’s for a movie script. Spiegel and Stanford classmate Bobby Murphy created not just a mega-hit when they developed their app as part of a design class, but an entire new category in transitory communication.