Small is only too aware of what too much time spent online can do to other mental processes. Among the young people he calls digital natives (a term first coined by the US writer and educationalist Marc Prensky), he has repeatedly seen a lack of human contact skills – “maintaining eye contact, or noticing non-verbal cues in a conversation”. When he can, he does his best somehow to retrain them: “When I go to colleges and talk to students, I have them do one of our face-to-face human contact exercises: ‘Turn to someone next to you, preferably someone you don’t know, turn off your mobile device.’ One person talks and the other one listens, and maintains eye contact. That’s very powerful. One pair of kids started dating after they’d done it.