VANCOUVER — Ssonia Ong had no idea that a 25-second video she posted miming to music the story of her college love, her wedding, then her four children would go viral on TikTok. Three years later, with 9.2 million followers, Ong isn't sure what she would do without it. She is one of several Canadian "influencers" on the video-hosting service who depend on the app who are voicing their concerns about a growing call worldwide to ban TikTok over the possibility its Chinese owner may allow sensitive user data to be handed over to China's government. Lawmakers from Canada, the...