Twitter is a platform for communicating with the world, Facebook is platform for communicating within your social network. For the majority of people, Facebook

Twitter is a platform for communicating with the world, Facebook is platform for communicating within your social network. For the majority of people, Facebook will always be the more important platform because we _all_ have an interest in communicating with our social network. Fewer people have a reason to communicate with the world. Many here have start-ups they want to share, some people are trying to create music, and some just want to create a self-contained cult of personality. As these kids get older I expect the division between who does and doesn't "graduate" to Twitter will depend on who evolves into having a reason to communicate with the world. I do expect the percentage of people who will have a reason to "communicate with the world" will steadily increase, but slowly relative to one generation growing up. (As manufacturing/information technology increases, the size of companies will decrease -- smaller companies mean more people will have the role of "communicating with the world" for their company.) Everyone will use Facebook.