I ask a teenage girl, how often do you text? "250 times a day, or something," she tells me. Shocking! The digital lives of teenagers have become the target of weekly attacks. In a recent essay for the Guardian, the novelist Jonathan Franzen bemoaned online socialising, arguing that it was creating a uniquely shallow and trivial culture, making kids unable to socialise face to face. Then the American comedian Louis CK proclaimed on TV that he wouldn't give his daughters cellphones for fear they wouldn't develop empathy.