When Sam Altman visits New York, he’s never alone for very long. Altman is the 24-year-old CEO of Loopt, a company that makes a “location-aware” app for mobile phones that tracks where all of your friends are and what they’re doing. “I’ll pull it out on the ride in from the airport, and before I’ve […] When Sam Altman visits New York, he's never alone for very long. Altman is the 24-year-old CEO o