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The Facebook and WhatsApp applications' icons are displayed on a smartphone on February 20, 2014 in Rome. The deal unveiled the day before worth up to $19 billion -- seen as the largest for a venture-backed tech startup -- gives Facebook entry into emerging markets and importantly keeps the app out of the hands of rivals like Google. US stocks rose modestly in early trade today as investors slammed Facebook's huge acquisition of WhatsApp and Wal-Mart Stores turned in disappointing earnings for the holiday season. AFP PHOTO / GABRIEL BOUYS Gabriel Bouys/AFP/Getty