TikTok went dark for American users in an unprecedented display of the U.S.-China divide over technology and national security.The app started halting service Saturday night for 170 million users in its most important market shortly before a law took effect requiring it to shed its Chinese ownership or close in the U.

"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 wi