(Reuters) - Standard & Poor's on Wednesday said Facebook Inc will join its S&P 500 stock index after the close of trading on December 20, cementing the social media network's rise into one of the biggest, most powerful U.S. companies. The decision follows Facebook reporting its fourth straight profitable quarter in October, one of the criteria that S&P uses to determine eligibility for the index. Facebook shares rose 4.3 percent to $51.51 following S&P's announcement after regular market hours. Shares often rise after a company is tapped for inclusion in the S&P 500, because many investors track the index and buy shares of companies that enter it. The Menlo Park, California-based company's...
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