Jack Dorsey, chief executive, said he saw a "significant opportunity to increase growth" as the company improved the platform.
Live video
"We have a clear plan, and we're making the necessary changes to ensure Twitter is positioned for long-term growth," he said.
"The key drivers of future revenue growth are trending positive, and we remain confident in Twitter's future."
Twitter's user base remains less than a fifth of Facebook's and is also fewer than Instagram, the picture app that Facebook owns.
The company hopes that live video will attract more users and recently struck a high-profile deal to show National Football League games in the US on Thursday nights.
The site will also introduce "meaningful updates" next month in a bid to better protect users from abusive content - an issue that Twitter has been widely criticised about