Research shows that if people are talking and listening to like-minded others, they become more dogmatic, more unified, and more extreme. Personalized Facebook experiences are a breeding ground for misunderstanding and miscommunication across political lines and, ultimately, for extremism.

Facebook seems to think that it would be liberating if everyone's News Feed could be personalized so that people see only and exactly what they want. Don't believe it. That's a prison.

In a well-functioning democracy, people frequently encounter topics and points of view that they did not specifically select but from which they learn. Those encounters can change minds and, even, the course of lives.

Cass Sunstein Quotes