Television is much more difficult because at every moment, the network can force you to change things based on their belief about what would make it popular. You’re in a constant debate with a gun to your head, and the gun is cancellation. So it’s hard to win the arguments.
The more you enter, the more you become locked in. Your social-networking site becomes a central platform - a closed silo of content, and one that does not give you full control over your information in it. The more this kind of architecture gains widespread use, the more the Web becomes fragmented, and the less we enjoy a single, universal information space.