US STOCKS-S&P 500 suffers worst day since late Aug; Twitters surges By: Reuters: Company News November 07, 2013 at 16:31 PM EST * Twitter shares soar as much as 92 pct in frenzied NYSE debut Read More >> Related Stocks: Europe ETF FTSE Vanguard Facebook NVIDIA Corp Qualcomm, Inc. Tesla, Inc. The Priceline Group Twitter, Inc. Walt Disney Whole Foods Market