Files on iTunes - and thus iPods - are incompatible with everything else. Applications on iPhones may only be sold and uploaded through the iPhone store - giving Apple control over everything people put on to the devices they thought they owned.

It's not that MySpace lost and Facebook won. It's that MySpace won first, and Facebook won next. They'll go down in the same order.

We are moving away from myths and toward fantasy role-playing games, away from movies and toward videogames.

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.

For Google, the problem with being a free, abundant, and rather infinite set of services is that it's hard to create much of a stir about anything. There are so many major software service options under the 'more' menu on the Gmail page that they've had to go and add a final item called 'even more.'

Virtual simulations allow post-traumatic stress disorder sufferers to re-experience the events that traumatized them, and then slowly desensitize themselves to their impact through repeated recreations involving not just sight and sound but even smell.

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.