SAN FRANCISCO (AP) - Twitter's losses are mounting as the messaging service struggles to grow its audience under recently hired CEO Jack Dorsey.

SAN FRANCISCO (AP) Twitter's losses are mounting as the messaging service struggles to grow its audience under recently hired CEO Jack Dorsey.

The challenges facing Dorsey came into sharper focus in a third-quarter report released Tuesday. The numbers covered the three months ending in September. That's when Dorsey served as interim CEO before he was hired on a permanent basis.

Twitter ended the period with a core audience of 307 million active users, an increase of just 3 million from June. That wasn't much better than a gain of 2 million users in the previous quarter, a letdown that led to the departure of Twitter's previous CEO, Dick Costolo.

Revenue climbed 58 percent from last year to $569 million.

Twitter still lost $132 million. The company's stock plunged 11 percent in extended trading.