The trouble with TV, people have been saying for years, is that it's not interactive. It's a passive medium, and for a generation raised on the internet, that's a big problem, especially since interactive TV turned out to be such a flop.
The other problem identified is that TV isn't social. It's a one-to-many technology. Not only can I not talk back to it, I can't use it to talk to my friends.
TV has proved fairly resilient so far, however. It's showed no sign of going the way of the CD. This shouldn't be so surprising - you can't beat a big screen with moving pictures and decent sound for entertainment, immersion and emotional power. Nor is it easy to replicate that feeling of sharing in a communal moment you get when you watch any programme with a big audience.
But there's something else. I think what people have underestimated is TV's adaptability - the way that it works as a hub for plug-in devices. DVR (Sky Plus/Tivo etc) is the most obvious. But a plug-in doesn't literally have to plug in, or be designed for TV-compatibility, to function as enhancer of the TV experience.
Twitter is a TV plug-in. As this New York Times piece explains, people are using Twitter more and more as a kind of user-created subtitling, or commentary (adoring/trashing/ironising) on whatever's on the box. "Event TV" in particular benefits from this effect. In the US, audiences for large events like audiences for large events like the Super Bowl and the Olympics have been breaking records - we've seen the same here with X-Factor. This effect may be good news in particular for the biggest, established mainstream channels (ITV here, NBC/ABC etc in the US) which have lost so much share in recent years, because they have the conversation-generating reach, and mass-appeal content that smaller channels don't.
So one way to think about Twitter is as the latest in a short but powerful series of TV-enhancing innovations (colour, remote controls, video, DVR...). Twitter effectively plugs those two holes in the TV offer: interactivity and social-ness. But it's not a one-way benefit: social media benefit because TV brings what they don't have - an immersive sensory experience.
Together, TV and Twitter form a powerfully compelling nexus. It will be around for a while yet.
