TikTok went dark for users across the U.S. late Saturday as the app notified users of a ban that went into effect just days before President-elect Trump's inauguration.

Even if temporary, the unprecedented shutdown of TikTok will have an impact on U.S.-China relations, domestic politics, the social-media marketplace and millions of Americans who depend on the app.

The app started halting service Saturday night for 170 million users in its most important market.