The sun rises behind the entrance sign to Facebook headquarters in Menlo Park before the company’s IPO launch in this May 18, 2012 file photo. Game provider Zynga Inc slashed its 2012 outlook and quarterly results badly missed Wall Street targets, sending its stock plunging 35 percent and casting a chill over Facebook Inc on the eve of the social network’s inaugural results. REUTERS/Beck Diefenbach/Files (UNITED STATES – Tags: BUSINESS MEDIA)