Twitter: the future “pulse of the planet”

“If [Twitter] had a billion users, that will be the pulse of the planet.”

—  from TechCrunch, who received Twitter’s internal documents from a hacker

TechCrunch estimates that Twitter currently has 20 million U.S. users, “and nearly double that worldwide.”

So, Twitter’s got a ways to go, but the document projects it’ll reach that billion in five years, by 2013.

And oh yeah, it says it needs to make more revenue, too.  It wants to work up to “$1 per user per year.”