Followers: 1 million
Sample tweet: "We know that we can't feed all starving children. But consistency doesn't require us to feed none. If we can save Libyan lives, let's do it. "
Nick Kristof, a columnist for the New York Times, offers a smart take on world affairs informed by experience — he was on the ground in Egypt during the revolution, the latest stop in the well-traveled journalist's trips to crisis zones and impoverished areas around the world.