This week, Google announced that it had sold its Zagat guide business, for which it paid a stunning $151 million in 2011, for "an undisclosed amount" to a company you've likely never heard of, The Infatuation. It's an ignominious development for the former household name brand, and true pioneer in the data business. Well before the Internet, Zagat had blazed new trails in the area of user-generated content and consumer reviews. Tim and Nina Zagat, the founders, proved to be creative and talented...