but the pepsi c.e.o. called 2012 a "pit-stop year to refuel." shares certainly hit the brakes, falling almost 4% on heavy volume. the company rejected calls for it to split its beverage business from its frito-lay snack division. it's a different story at snack food maker diamond foods. the company will restate two years of financial results and replace its top two executives. shares took a nosedive, losing more than a third of their value. the company has been under increasing pressure for its accounting of payments to walnut farmers. the trouble also has put pressure on diamond food's plans to buy the pringles brand from p&g for close to $1.5 billion. an improving job market is good news for linkedin, the social networking site for professionals. earnings were better than anticipated, and showed a 30% jump from a year ago. shares came into tonight's earnings report off a fraction, but rebounded 4% in after-hours action. other new dot-com stocks saw heavy selling after their first earnings reports as public companies. groupon shares tumbled 14%