The head of Canada’s intelligence agency CSIS says Canadians should stay away from TikTok because it poses a data security risk. He says it’s very clear from the app's design that Canadian data is available to the government of China. "Most people can say, 'Why is it a big deal for a teenager now to have their data [on TikTok]?' "We know that a lot of people, particularly young people, enjoy using TikTok and we need to make sure that usage is safe. Vigneault is not the only senior Canadian intelligence official to weigh in on the use of TikTok.