Nobody is denying that Twitter is a great tool for a lot of people, the author included. But this pool of people is too small for Twitter's investors. And the w

Nobody is denying that Twitter is a great tool for a lot of people, the author included. But this pool of people is too small for Twitter's investors. And the way Twitter works currently, the pool looks difficult to grow. Hence all the handwringing about how to make Twitter appeal to a larger audience without losing the power users it already has.