In Texas, Florida, and more than a dozen other states, users who try to access the world’s largest pornography website are greeted by a surprising sight: a message on a black screen telling them they’re blocked because of the actions of their state legislature.

The Supreme Court seems likely to uphold a law that would ban TikTok in the United States beginning Jan. 19 unless the popular social media program is sold by its China-based parent company.

The Supreme Court on Friday was divided over the constitutionality of a federal law that would require social-media giant TikTok to shut down in the United States unless its Chinese parent company can sell it by Jan.