<p>The encrypted messaging app Telegram is haunted by a single question - if it really is as secure as it claims to be, why does Vladimir Putin allow it to be used in Russia?</p><p>And should Russian dissidents, independent journalists and Ukrainian soldiers use this Wild West of an app, where you can find everything from porn to drugs to faked propaganda videos? </p><p>Answering those questions takes Helen on a journey that begins with a young Russian entrepreneur throwing 5,000 rouble notes off a balcony, folded like paper aeroplanes, and finishes with him in exile in Dubai, rich beyond his wildest dreams. But what does Pavel Durov, the founder of Telegram, really believe? </p><p>Producer: Tom Pooley Assistant Producer: Orla O'Brien Sound Design: Louis Blatherwick Editor: Craig Templeton Smith Original Music: Coach Conrad</p><p>A Tempo &amp; Talker production for BBC Radio 4</p>