Twitter Shares Slump As Stock Lock-Up Expires

(Reuters) - Shares of Twitter Inc. fell more than 12 percent in morning trading on Tuesday after the expiration of a six-month "lock-up" period for early investors that had restricted the sale of about 82 percent of the company's equity. Twitter's shares hit a low of $34 on the New York Stock Exchange, the first time they have fallen below $37 since they started trading on Nov. 7. Over 6 million shares had changed hands by midday - four times the average daily volume. Twitter's IPO was priced at...