TikTok, the most popular app among young people, has nearly 1.6 billion users worldwide, including almost one in three French citizens. Often seen as a platform for dances, animals, music, and star influencers, it is above all a global success story from China, owned by the company ByteDance. Its content management system remains opaque, even to its moderators. Accused of collecting personal data like other social networks, TikTok is also suspected of sharing that data with the Chinese government and influencing public opinion worldwide.