Imagine what would happen if the United States ran out of phone or social security numbers. We would be unreachable, even unidentifiable! That is exactly what's happening with IP addresses: those codes that identify each blackberry, iPad, and Website. IP addresses are set to run out in less than a year. Alexis Madrigal, lead technology writer for TheAtlantic.com joins us to talk about what this means in terms of the way we communicate in an Internet-driven world.