When you go onto the internet, if you really rummage around randomly then how do you hope to find something of any of value?
Tim Berners-LeeThe 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.
Tim Berners-Lee