Closing Bell: Twitter Tumbles; Another Selloff For Crude

Commodity traders relived the nightmare of yesterday's selloff as crude oil again spiraled lower. This time crude took broader markets down with it with the Dow Jones Industrial Average losing more than 300 points at its session low. Michael Kors (KORS) ended the day sharply higher after reporting sales growth of just over 6% this holiday quarter. Earnings beat estimates even as the company suffered from a stronger U.S. dollar and softer demand for its luxury handbags and watches. It was a rocky day of trading for Pfizer (PFE) which initially slumped after issuing disappointing guidance for the full year. The drugmaker said increased competition from cheaper generic drugs would cut into sales. TheStreet's Keris Lahiff reports from Wall Street.