Twitter Inc. (TWTR.N) is considering building a premium version of the popular Tweetdeck user interface intended for professionals, the company said on Thursday, raising the possibility that it will create a subscription fee for some users for the first time turn.

Like most other social media companies, Twitter since its inception 11 years ago has supported the focus on building a large user base through free advertising services. Last month, it announced there are 319 million users worldwide.

But unlike Facebook’s biggest (Inc. FB), Twitter is not enough to attract advertising revenue to make a profit, despite its popularity, the president of the United States, Donald Trump and other celebrities who have made a number of Spotlights in progress.

Subscription costs may be the Tweetdeck version, the user interface available that allows users to browse Twitter.

Twitter conduct a study “to assess the significance of the new and improved version of Tweetdeck,” a spokeswoman Brielle Villa Blanca said in a statement on Thursday.

He continued: “We always engage in research to make users feel feedback on Twitter and make our products better investment decisions informed, and we have a variety of ways to explore Tweetdeck to make more valuable to professionals.”

There is no indication that Twitter is considering usage fees.

The previously leaked investigation on Twitter, where the vendors who served in the New York Times posted a screenshot of what the premium version of Tweetdeck might look like.

This release may be “most powerful tool for marketers, journalists, professionals and others in our community to know what is happening in the world more quickly,” said one of the images posted on the @andrewtavani account.

The experience may be advertising, said the shooting

Membership-level subscription version

Social media companies, such as the Microsoft (MSFT.O) LinkedIn unit, have a , which offers access and better information.

In the fourth quarter of 2016, Twitter has seen the slowest growth in sales since it became public four years earlier, and advertising revenue fell compared to the previous year. The company also said that ad revenue growth will continue to lag behind the growth in the number of users during 2017.

Twitter financial speculation last year, but no concrete offer has come