The U.S. government will investigate Beijing-based TikTok owner ByteDance’s acquisition of social media app Musical.ly. TikTok has been growing more popular among U.S. teenagers at a time of growing tensions between the U.S. and China over trade and technology transfers. Last month, Musical.ly founder Alex Zhu, who heads the TikTok team, started to report directly to ByteDance CEO Zhang Yiming.