Twitter stock tumbles as user growth stalls
![](http://d1bdhkmqqz901h.cloudfront.net/1200x630/smart/s3.amazonaws.com/hne-smedia/6/f/6f0f754473bf42799fae06612951e291/web_full_107096285533.jpg)
NEW YORK - Tepid user growth and ongoing uncertainty about its leadership dragged Twitter's stock to its lowest level in over a year Wednesday, even though the short-messaging service reported sharply quarterly higher revenue.