TikTok

"A law banning TikTok has been enacted in the US," the message said. "Unfortunately that means you can't use TikTok for now."

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Saturday encountered a pop-up message preventing them from scrolling videos that read, "Sorry, TikTok isn't available right now."

"We are fortunate that President Trump has indicated that he will work with us on a solution to reinstate TikTok once he takes office," the notice continued, in a reference to president-elect Donald Trump's pledge to "save" the platform. The company told its users to stay tuned.

The only option the message gives to US users is to close the app or click another option leading them to the platform's website. There, users are shown the same message and given the option to download their data, an action TikTok previously said may take days to process.

Before the announcement went out, TikTok said in another message to users that its service would be "temporarily unavailable" and the company was working to restore its US service "as soon as possible." But how long the platform will remain dark is unclear.

Apple said in a statement on its website that TikTok and ByteDance apps were no longer available in the US, while visitors to the country could have limited access.

"If you already have these apps installed on your device, they will remain on your device. But they can't be redownloaded if deleted or restored if you move to a new device. In-app purchases and new subscriptions are no longer possible," the statement said, adding that the change could impact performance, security and compatibility with future versions of iOS and iPadOS.

TikTok CEO Shou Chew posted a video thanking Trump for his commitment to work with the company to keep the app available in the US and a "strong stand for the first amendment and against arbitrary censorship."

In an interview with NBC News on Saturday, president-elect Donald Trump said he was thinking about giving TikTok a 90-day extension that would allow them to continue operating.