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https://static01.nyt.com/images/2025/01/19/multimedia/tiktok-whatweknow-mbvf/tiktok-whatweknow-mbvf-videoSixteenByNine3000.jpgThe popular video app went dark in the United States late Saturday, as a law banning it took effect. Now, the company is hoping President-elect Donald J. Trump can bring it back.