Most of the world's internet billionaires do as much as possible to keep a public profile. Mark Zuckerberg, the founder of Facebook, incessantly updates his fans with tales of his travels, meetings with world leaders, and family photos. Tech boss Elon Musk tweets furiously about the latest goings on at Tesla and SpaceX, often in lengthy streaks of messages that manifest his own stream of consciousness.

But search the internet for any profile of Evan Spiegel, and you will come up short. At 26 - an age that makes him the first self-made billionaire born in the 1990s - the founder of Snapchat is supposed to represent a generation that grew up with the internet and is supremely comfortable about sharing their lives online.

The Telegraph London