The app had more than 170 million monthly users in the U.S. The black-out is the result of a law forcing the service offline unless it sheds its ties to ByteDance, its China-based parent company.

The social media company earlier said that it would be forced to go dark on Sunday unless the Biden Administration provided a "definitive" statement about its future

In an unsigned opinion, the Court sided with the national security concerns about TikTok rather than the First Amendment rights. There were no noted dissents.