In this July 24, 2014 file photo, Facebook staff members attend the opening ceremony of their new office in Hong Kong. The world's biggest online social network knocked Wal-Mart, the world's largest retailer, out of the top 10 list of the highest-valued companies in the Standard & Poor's 500 index on Monday, June 22, 2015, and the gap widened on Tuesday. (AP Photo/Kin Cheung, File)
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