Zimbardo was the psychologist behind the famous 1971 Stanford Prison Experiment, so has a reputation in his field as something of a heavy hitter.

Here, he's preoccupied with the effect of computer games, online pornography and social media on boys and young men who, he says, are falling behind "academically, socially and sexually". Risk-averse, filled with a sense of entitlement and reluctant to grow up and become responsible breadwinners, they retreat into games and porn as environments in which they can exercise control, thus avoiding the uncertainty and challenge of real life. With a book like this, there's always the suspicion that the author is promoting an agenda, and the subtitle, "How technology has sabotaged what it means to be male", suggests he has a privileged understanding of what it means to be male in the first place. Many good points are made here, but you might find yourself wishing a higher standard of objectivity and rigour from someone of Zimbardo's background.