Social media loves echo chambers, but the human brain helps create them — Quartz

This … does not make me particularly optimistic about the human tendency towards cognitive laziness.

Julia Shaw, a psychologist and author of The Memory Illusion, says memes “generally do win.” We’re exposed to so much information that digesting and remembering only the most succinct and appealing snippet—say, a misleading headline—becomes second-nature. Some politicians are already exploiting that dissonance by promoting an intentionally broad range of ideas, even including conflicting ones, so that supporters can cherry-pick the messages they prefer.
“By having a campaign that says lots of different and sometimes contradictory things, you give people the ability to only remember and care about things that match their worldview,” Shaw says.

Source: Social media loves echo chambers, but the human brain helps create them — Quartz