NEW YORK (AdAge.com) -- LinkedIn may be the least glitzy of the major social media sites but it's also one of the most successful. Launched in 2003, it's been making a profit since 2007 and, despite the recession, some of its ad categories continue to sell at CPMs of $50 or more. Unlike Facebook or MySpace, it doesn't offer games or apps designed to maximize the time users spend there. It's a network for business people and its goal is to minimize the time its users spend to get what they need from each other. In this eight-minute interview, founder and chairman Reid Hoffman discusses LinkedIn's current operations.