Shares traded in Wall Street decreased on Thursday as the social media network Twitter entered the markets rising 92% in its first trading day on the NYSE, however, the benchmark S&P 500 suffered its worst daily drop since August. The Dow Jones Industrial average fell 0.97% to 15,593.98, the S&P 500 Index slipped 1.32% to 1,747.15 and the Nasdaq Composite index slid 1.90% to 9,857.33.