The Black Hat hacker conference in Las Vegas last week, where speakers asserted their ability to tap into and manipulate everything from airport security systems to the lights in your hotel room. Photograph: Steve Marcus/Reuters

Facebook was in touch the other day. “Help your friends recognise you,” they wrote. “Add a profile picture.”My instinctive reaction was: Why? So it co(...)

Kolin Burges, a Mt Gox customer, holds a placard in front of a building housing the company operating the Mt Gox Bitcoin exchange in Tokyo, Japan. Photograph: Tomohiro Ohsumi/Bloomberg

Mt Gox, once the world’s biggest bitcoin exchange, filed for bankruptcy protection today, saying it may have lost all of its investors’ virtual(...)