You may have heard the joke: the best way to do product design for Facebook is to get a job at Snapchat. We've all seen how, after failing to buy the company, Facebook has wasted little time in building its own versions of most of Snapchat's key features. So... is this a problem? That's the subject on this week's episode, were we discuss the ins and outs of this kind of copying and what it might mean for the future of social media.