There is another way to look at this shift. Younger people, one could point out, are the only ones for whom it seems to have sunk in that the idea of a truly private life is already an illusion. Every street in New York has a surveillance camera. Each time you swipe your debit card at Duane Reade or use your MetroCard, that transaction is tracked. Your employer owns your e-mails. The NSA owns your phone calls. Your life is being lived in public whether you choose to acknowledge it or not.

So it may be time to consider the possibility that young people who behave as if privacy doesn't exist are actually the sane people, not the insane ones. For someone like me, who grew up sealing my diary with a literal lock, this may be tough to accept. But under current circumstances, a defiant belief in holding things close to your chest might not be high-minded. It might be an artifact -- quaint and naive, like a determined faith that virginity keeps ladies pure. Or at least that might be true for someone who has grown up "putting themselves out there" and found that the benefits of being transparent make the risks worth it. [...]

For anyone over 30, this may be pretty hard to take. Perhaps you smell brimstone in the air, the sense of a devil's bargain: Is this what happens when we are all, eternally, onstage? It's not as if those fifties squares griping about Elvis were wrong, after all. As Clay Shirky points out, "All that stuff the elders said about rock and roll? They pretty much nailed it. Miscegenation, teenagers running wild, the end of marriage!"