Facebook Cracks Fortune 500 List Walmart takes No. 1 By Ruth Brown, Newser Staff Posted May 6, 2013 3:50 PM CDT 0 comments Comments Facebook CEO Mark Zuckerberg, 28, is the youngest CEO on the 2013 Fortune 500 list. (AP Photo/Paul Sakuma, File) (Newser) – Fortune released its annual Fortune 500 rankings today, determining once again which American companies are best at capitalism in 2013. Notable takeaways include: Walmart reclaimed the No. 1 position with a revenue of $469.2 billion, sending oil companies Exxon Mobil ($449.9 billion), Chevron ($233.9 billion) and Phillips 66 ($169.6 billion) spilling into second, third and fourth place respectively, reports CBS. Facebook made the list for the first time, coming in at No. 482 with $5.1 billion, less than a year after going public. That's the fastest any company has ever made the list after becoming public, notes Mashable. And at 28, Mark Zuckerberg is the youngest CEO to make the list, adds NPR. Apple cracked the top 10 for the first time, taking No. 6 with $156.5 billion. When ranked on profits alone (the list ranks revenue), Apple is No. 2, reports CBS. Total revenues for all companies on the list was up 2.7%—though profits were down 0.5%, says NPR. Click to read the full list here.