FILE - This Friday, Oct. 18, 2013, file photo, shows a Twitter app on an iPhone screen, in New York. Twitter says that four executives are leaving the company. Twitter CEO Jack Dorsey posted Monday, Jan. 25, 2016, that Alex Roetter, Skip Schipper, Katie Stanton and Kevin Weil are exiting the company. Roetter served as senior vice president of engineering, Schipper was vice president of human resources, Stanton was vice president of social media and Weil was senior vice president of product. (AP Photo/Richard Drew, File)