Twitter has reported an impressive 58% rise in revenues, but has disappointed shareholders with slow user growth.

The social media giant posted revenues of $569 million in the three months to September, up from $361m in the same period last year.

Over the year, Twitter's user number grew 11% to 320 million. But compared with the previous quarter, it reported just 1.2% growth.

It is the company's first financial results since co-founder Jack Dorsey was reinstated as chief executive. He said: "We've simplified our roadmap and organization (sic) around a few big bets across Twitter, Periscope, and Vine that we believe represent our largest opportunities for growth."