Anything could be harmful. They haven’t been taught how to discern whether a source is credible. They’ll just believe what people tell them if they see no reason to doubt. I do think that just because misinformation exists, that doesn’t necessarily mean your teen will buy into it forever. I think being misled is part of the process of learning how to identify trustworthy sources. Rather than controlling access to information, reinforcing your kids’ understanding of logical and evidence-based reasoning will pay off in the long run.