It's been revealed that FaceTime - the video calling app on iPhones - has a glitch that allows people to eavesdrop on the person they're calling - even if the recipient doesn't pick up. In some cases it's even possible to see video of the person being called, before they pick up. Apple has acknowledged the flaw in the software, and has disabled the group conversation function, which was allowing the spying to happen. The flaw was discovered as concerns are growing around the world about digital privacy. Tech commentator Paul Brislen joins us.