U.S. stocks opened mixed Friday as they cling to gains for the month of July. Royal Caribbean Cruise Line (RCL) raised its full year outlook. Tyco (TYC) beat profit on expectations despite currency fluctuations. Wage growth slowed in the second quarter according to the Employment Cost Index. Exxon Mobil (XOM) delivered quarterly earnings that fell short of analysts' expectations, hurt by lower oil prices. The oil giant's profits were the lowest since 2009. The world's largest publicly traded oil company reported a 52% slide in profit as oil prices have fallen 50% in the past 12 months. Unions are gaining ground in Silicon Valley. Shuttle drivers for Apple (AAPL), eBay (EBAY), Yahoo (YHOO), and Zynga (ZNGA) and several other Silicon Valley firms are set to vote tomorrow on a package for improved wages and benefits.