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He's been dubbed "Russia's Mark Zuckerberg" due to his success, but he was forced out of the company that made him his fortune. Now his new app has gained 100 million users.
Durov is known for his unique lifestyle: He only wears black, and he travels constantly around the world. He's had run-ins with armed gangs, the Kremlin, and once threw money out of his office window.
Here's the incredible, and often bizarre, story of Durov's life: