What you need to know:

• Under a law passed last year and upheld on Friday by a unanimous Supreme Court, the platform has until Sunday to cut ties with its China-based parent ByteDance or shut down its U.S. operation. 

TikTok stopped working in the United States late on Saturday and disappeared from Apple and Google app stores ahead of a law that takes effect on Sunday requiring the shutdown of the platform used by 170 million Americans.

President-elect Donald Trump has said he would "most likely" give TikTok a 90-day reprieve from the ban after he takes office on Monday, a promise TikTok cited in a notice posted to users on the app.

A law banning TikTok has been enacted in the U.S. Unfortunately, that means you can't use TikTok for 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. Please stay tuned," the message notified users trying to use the app late on Saturday night.

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