The Facebook logo is pictured at the Facebook headquarters in Menlo Park

The Facebook logo is pictured at the Facebook headquarters in Menlo Park, California, in this January 29, 2013 file photo. Facebook Inc advertising business grew at its fastest clip since before the company’s May initial public offering, helping the company’s revenue expand 40 percent to $1.585 billion. REUTERS/Robert Galbraith/Files (UNITED STATES – Tags: BUSINESS LOGO)