In an interview with Justin Smith at InsideFacebook we got talking about advertising formats that are best suited to social media environments, and I proposed that previous media revolutions -- like radio and TV -- offer instructive analogies: "[If you take] a look at radio (the internet of our grandparents' day), people listened to news clips and radio plays. If you go back and listen to advertising during radio plays, the ad is a mini version of a radio play.