My thoughts on this are that we are in a period of
Low friction to create content => cheap, easy, mass volumes of content
AND no curation based on accuracy, scientific rigor, and truthfulness.
In fact the curation is biased heavily towards content which makes the reader strongly feel something. Outrage, joy, sadness... They acknowledge those feelings by sharing, tweeting, liking, upvoting. All measured by the proxy metric "engagement".
"Engagement" is the enemy in these issues as while it symbolizes usage to a social media company trying to blitz scale, in actuality it symbolizes content that made someone feel a strong emotion and NOT content that is accurate, truthful, and scientific.
Everyone is optimizing for content to go viral in order to get eyeballs on it and that automatically means content skewed to generate outrage, sadness, or joy. And as the competitions heats up, the content has to become even further optimized for feelings generation in order to win out over other similarly skewed content.
This is why social media unintentionally became one of the biggest problems that truth and science has ever faced.