NEW YORK -- Multinational retailer Tesco is still trying to understand the value of social networking sites like Facebook and Twitter, said one of the company's top executives at the National Retail Federation's Big Show here Monday. "I am a bit less messianic about this," said Andrew Higginson, chief executive of retailing services and group strategy director, Tesco, speaking on a panel with other retail executives. "We have not put a lot of money on it, but we are trying to understand it. ...

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