As a writer and sometime activist who needs to promote my books and articles and occasionally rally people to one cause or another, I found Facebook fast and convenient. Though I never really used it to socialize, I figured it was OK to let other people do that, and I benefited from their behavior.

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

The early cyberpunk idea was that networked computers would let us do our work at home, as freelancers, and then transact directly with peers over networks. Digital technology would create tremendous slack, allow us to apply its asynchronous, decentralized qualities to our own work and lives.

Remember when those CD-ROMs from AOL came in the mail almost every day? The company was considered ubiquitous, invincible. Former AOL CEO Steve Case was no less a genius than Mark Zuckerberg.

Global warming, you don't win it. It's this weird steady-state issue that's going to be with us for a few thousand years.

Most of us still haven't grasped the fact that everything we commit to the digital space - not just our public blogs and broadcast tweets, but every private text message, email, and voicemail is likely to be stored and accessible. Forever.

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.