The true end users of Facebook are the marketers who want to reach and influence us. They are Facebook's paying customers; we are the product. And we are its workers. The countless hours that we - and the young, particularly - spend on our profiles are the unpaid labor on which Facebook justifies its stock valuation.

Invest in people who will take care of you when you're old.

Mobile notifications put people in a state of perpetual emergency interruption - similar to what 911 operators and air traffic controllers experienced back in the '70s and '80s.

'Digiphrenia' is really the experience of trying to exist in more than one incarnation of yourself at the same time. There's your Twitter profile, there's your Facebook profile, there's your email inbox. And all of these sort of multiple instances of you are operating simultaneously and in parallel.

The tribal community lived in the totality of circular time; the farmers of God's universe understood before and after; workers of the clockwork universe lived by the tick; and we creatures of the digital era must relate to the pulse.

Most simply, 'present shock' is the human response to living in a world that's always on real time and simultaneous. You know, in some ways it's the impact of living in a digital environment, and in other ways it's just really what happens when you stop leaning so forward to the millennium and you finally arrive there.

Social media is itself as temporary as any social gathering, nightclub or party. It's the people that matter, not the venue. So when the trend leaders of one social niche or another decide the place everyone is socializing has lost its luster or, more important, its exclusivity, they move on to the next one, taking their followers with them.