May 6, 2013 Facebook, which went public in May of 2012, made the list for the first time. Its CEO, Mark Zuckerberg, 28, is the youngest on the list.
January 25, 2013 Apple stock has dropped sharply since it announced earnings that disappointed analysts. Now the tech tastemaker is paying another price, losing its crown as the world's most valuable company to Exxon Mobil. Exxon's market capitalization totaled $417 billion Friday, $4 billion more than Apple's.