Bitcoin has made billionaires out of the Winklevoss twins, thanks to a fear of astro-gold crashing the market that encouraged them to support the currency. The American entrepreneurs are perhaps most famous for claiming that Mark Zuckerberg stole their idea for Facebook, a story immortalized in The Social Network. On Monday, it emerged the 36-year-old twins’ investment in the cryptocurrency back in 2013 has paid off in a big way.