NEW YORK (AdAge.com) -- We're in a nondescript office building in an equally nondescript business park in a burgeoning, standing-on-the-shoulders-of-Walmart section of northwest Arkansas on a hot August day. Clusters of young coders and developers sit in a dimly lit room, their eyes glued to giant flat-screen computer monitors. On another side account directors yammer with clients in cubicles that are cluttered with boxes of Walmart's Great Value cereal. And in the center, the CEO's wife stands barefoot in an oversized kitchen, baking blueberry muffins. READ MORE.