Guests of Twitter look at a camera before ringing the opening bell while waiting for shares of Twitter to be traded for the first time at the Twitter IPO on the floor of the New York Stock Exchange on Wall Street In New York City on November 7, 2013. The NYSE Euronext staged a first-ever weekend test for the initial public offer two weeks ago to avoid reprising the problems with rival Nasdaq's systems that delayed timely orders and ruined Facebook's debut on Wall Street. UPI/John Angelillo
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