A sign is posted on the exterior of the Twitter headquarters on February 5, 2014 in San Francisco, California.  Twitter reported fourth quarter revenue of
A sign is posted on the exterior of the Twitter headquarters on February 5, 2014 in San Francisco, California. Twitter reported fourth quarter revenue of $242.7 million, beating analysts expectations $217.82 million in revenue in their first quarterly report. ( (Photo by Justin Sullivan/Getty Images))