Twitter troubles deepen as lack of user growth threatens sales

The social media company added no new users in the fourth quarter

Twitter's revenue growth has been slowing

Twitter added no new users in the fourth quarter, confirming the fears of advertisers and investors alike: the social-media site is in real trouble.

The company has faced sharp criticism over slowing growth in its audience since its 2013 initial public offering. Even as chief executive Jack Dorsey rolled out efforts to make its product more mainstream, by some measures Twitter’s user base shrank from the third quarter.

Twitter tried to divert Wall ...