In the United States, liberals and conservatives do not only differ politically. They also live separate lives in the physical world.
When the organization of a social network impacts political discussion on a large scale, the consequences can be enormous.
A person's political identity is wrapped up in almost everything they do. Exposure to opinions from the other side actually makes it worse.
People know about Facebook's problems, but assume they are largely immune – even while they imagine that everyone else is very susceptible to influence.
Algorithms used by social media networks expose users to divisive content separating them into bubbles. But the ways in which they are trained amplifies the effects of the filter bubble.
Proust's masterpiece À La Recherche du Temps Perdu reveals how people's irrational beliefs become entrenched.