Moscow/Dubai — Even half-naked on Tinder, where he just popped up, Pavel Durov loves to play hard to get. "Not looking for anything serious or not serious here," the Russian privacy crusader warns potential dates in Dubai, where he’s finally trying to settle down after roaming the globe for three years. "Just playing with the app." Durov, 33, has been toying with technology a lot since he was forced to sell his remaining stake in Russia’s largest social network, VK, to a Kremlin-friendly billionaire in 2014. The encrypted messenger he’s been working on, Telegram, which he calls hack-proof, already has about 180-million users, including 40-million in Iran alone, and is luring half a million more each day. He and his older brother Nikolai, an award-winning mathematician and programmer, fine-tuned their software while moving from country to country, avoiding recruiters from spy and law-enforcement agencies such as the FBI, which he says tried to bribe one of his developers in San Franc...

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