In this Interview with Joe Rogan, Tristan Harris of the Center for Humane Technology drew a haunting analogy.  The discussion begins at 1:24.

Throughout the 1900's, lead was increasingly used in paint, gasoline and other products.  It was hailed as a miracle substance.

What are the Health Effects of Lead? Lead can affect almost every organ and system in your body. In children six years old and younger even low levels of lead in the blood of children is poisonous. It can result in behavior and learning problems, lower IQ and hyperactivity, slowed growth and many other problems. Beginning in 1965, it took the heroic efforts by geochemist Clair Cameron Patterson (and see here) to convince the U.S. Government (over systematic misinformation from companies who profited from the sale of products using lead) that lead in the environment was dangerous to humans.

Tristan Harris argues that social media is the new lead.  Instead of brain damage, however, social media causes people to distrust each other, making it impossible for people from the opposing tribes to work with each other or compromise with each other. Social Media is thus causing a massive breakdown of our political system. The following exchange begins at 85:21):

TH: Let's replace lead with problem solving capacity . . .  Imagine that we have a societal IQ or a societal problem-solving capacity the US has a societal IQ, Russia has a societal IQ, Germany has a societal IQ:  How good is a country at solving its problems? Now imagine, what does social media do to our societal IQ?

JR: It distorts our ideas. It gives us a bunch of false narratives. It fills us with misinformation.

TH: It makes it impossible to agree with each other, and in a democracy if you don't agree with each other and you can't even do compromise . . .  People recognize that politics was invented to avoid warfare. So we have compromise and understanding so that we don't physically become violent with each other.  We have compromise and conversation.  If social media makes compromise, conversation and shared understanding and shared truth impossible, it doesn't drop our societal IQ by four points. It drops it to zero, because you can't solve any problem, whether it's human trafficking or poverty or climate issues or racial injustice. Whatever it is that you care about, it depends on us having some shared view about what we agree on.