It's very easy to find articles that find that suggestion/engagement algorithms for YouTube, and presumably Facebook and others, pushes people toward more and more radical (extreme) content.
https://firstmonday.org/ojs/index.php/fm/article/view/10419/...
https://www.nbcnews.com/tech/social-media/algorithms-take-ov...
https://theconversation.com/youtubes-algorithms-might-radica...