Anecdotally my teen brother, the youngest (born over a decade after the rest of us), is remarkably even-tempered and not prone to fall for bad influences. He does spend a lot of time on IG, mostly looking at cars and making informative posts on automobiles. He watches a lot of documentary-like material on YouTube about engineering, physics, and sociology. He isn't likely to get these wild ideas his peers seem to fall for. My parents though, will fall for all manners of internet misinformation- the phenomena of believing nonsense online isn't exclusive to children and young adults.
With my brother I've found that if you treat younger adults and children with seriousness and listen to them as though their POV is valid, you build a trust there where they have a sense of where to discuss their doubts and insecurities so they don't fall prey to hypes and misinformation.
I mention this because I had a huge amount of influence on him growing up, almost the opposite of my experience with my parents dismissing and ridiculing my concerns. Although when I was a teen social media was mostly all chat rooms, forums, myspace, and then facebook (YouTube barely existed until the end of my adolescence) where I found people who listened- and there was the potential for them to have an influence which may have led to something very similar to this article.
Although social media now is vastly more powerful and common, it is not the sole variable. For many of these children it is filling a gap where a solid foundation of reality and context should be- with family members and social support structures who can be trusted to provide a reality check. I can see why many young ones listen to online personalities (many adults do, too) and although the medium through which they're getting these concepts (tiktok) plays a large part, it is not the root nor is avoiding tiktok the solution.
I would add, my parents moved us far from the town with the intent to take us away from bad influences of kids who hung out downtown- what this actually did is prevent me from being able to walk to the library, while my sister still found a way to get in trouble because lo and behold, her friends had cars or knew older kids with cars. The isolation they thought might be a solution proved ineffective, but I think if their parenting had been more nutruring and less abuse/neglect she might have avoided a lot of the trouble she got into.