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U.S. Stocks Drop as GDP Fuels Fed Concern; Twitter Soars

U.S. stocks fell, dragging the Standard & Poor’s 500 Index to its biggest loss in two months, as speculation the Federal Reserve may scale back stimulus amid faster-than-estimated economic growth overshadowed a move by the European Central Bank to cut a key interest rate.

Twitter Inc., which raised $1.82 billion in its initial public offering, rallied 73 percent in its debut. Qualcomm Inc. dropped 3.8 percent after the largest maker of smartphone chips predicted quarterly sales that missed analysts’ estimates. Whole Foods Market Inc. slumped 11 percent after cutting its profit forecast. J.C. Penney Co. jumped 5.6 percent after posting its first rise in monthly same-store sales in two years.