“A million dollars isn’t cool. You know what’s cool? A billion dollars,” Sean Parker says in the famous line from “The Social Network.” Trite though the line may be, Facebook, valued at $104 billion, ...

Dan Miller, a professor of material culture at University College London, caused quite a stir at the end of 2013 when he said Facebook was "basically dead and buried" for 16-18-year-olds in the UK. So ...