Twitter wows on revenue but user growth drags

Twitter nearly doubled its revenue last quarter, handsomely beating forecasts, but it continues to battle slow user growth.Twitter ended the fourth quarter of 2014 with 288 million monthly active users, up 20 percent from the same quarter a year earlier, it announced Thursday. That was the smallest growth rate Twitter has ever reported.Still, it managed to increase sales thanks to a strong advertising business. Total revenue for the quarter ended Dec. 31 was US$479 million, up 97 percent from