Twitter stock tumbles as user growth stalls

NEW YORK (AP) — 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.

Twitter is "not satisfied" with its user growth, co-founder Jack Dorsey, who replaced Dick Costolo as CEO earlier this month, said Tuesday after the earnings report. But that's unlikely to change any time soon.

Twitter doesn't expect to see "sustained, meaningful growth" of its number of users until it reaches the mass market, said Chief Financial Officer Anthony Noto. This, he said, will take considerable time.