London-based social-media app Fling burned through $21 million in less than three years. Fling never brought in any revenue. The founder splashed out on first-class flights, Ibiza hotels, and Michelin-star restaurants. The app struggled after Apple pulled it from the App Store last summer for becoming too sexually explicit. In early July 2015, temperatures were rising in the boardroom on the top floor of a 12-story office block in Hammersmith, West London.Marco Nardone, the 28-year-old CEO and founder of social-media app Fling, had called an emergency meeting the day after his app was removed from the App Store by Apple for being too similar to the notorious Chatroulette platform.The atmosphere was tense and Nardone was furious, three former employees said, because his COO, Emerson Osmond, had gone behind his back. Specifically, he was angry because Osmond had told Nardone's assistant not to order tents for the office that would allow staff to sleep by their desks and work around the c...