https://www.theguardian.com/technology/2019/dec/21/us-navy-bans-tiktok-from-mobile-devices-saying-its-a-cybersecurity-threat

Users who don’t remove the Beijing-based app will be blocked from Navy Marine Corp intranet

The United States Navy has banned the social media app TikTok from government-issued mobile devices, saying the popular short video app represented a cybersecurity threat.