Grunge was so self-consciously lowbrow and nonaspirational that it seemed, at first, impervious to the hype and glamour normally applied swiftly to any emerging trend. But sure enough, grunge anthems found their way onto the soundtracks of television commercials, and Dodge Neons were hawked by kids in flannel shirts saying, 'Whatever.'

Since the 1960s, mainstream media has searched out and co-opted the most authentic things it could find in youth culture, whether that was psychedelic culture, anti-war culture, blue jeans culture. Eventually heavy metal culture, rap culture, electronica - they'll look for it and then market it back to kids at the mall.

New content online no longer requires new stories or information, just new ways of linking things to other things. Or as the social networks might put it to you, 'Jane is now friends with Tom.' The connection has been made; the picture is getting more complete.

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.

We each create a story - a narritive, a picture, an allegory, a model - for what's going on in the universe. And then we fight - sometimes to the death - to make others believe in that model, or to be able to keep believing in it ourselves. In other words, we try to erase contradictory evidence to that model.

The reason why Apple computers have worked so well over time is that, unlike Microsoft, they don't bend over backward to be compatible with every piece of hardware or software in the digital universe. To code or create for Apple, you follow Apple's rules. If you're even allowed to.

We've been taught that the renaissance was one of the great golden ages of civilisation. The renaissance was not a golden age, it was the end of a golden age.