Like-minded sources on Facebook are prevalent but not polarizing

Area of Science:

• Social Media Studies
• Political Science
• Computational Social Science

Background:

• Concerns exist regarding social media echo chambers and political polarization.
• Limited data and experimental challenges hinder assessment of echo chamber effects.
• Active adult Facebook users in the USA were analyzed for content exposure patterns.

Purpose of the Study:

• To assess the impact of reducing exposure to like-minded content on social media.
• To investigate the relationship between social media echo chambers and political polarization.
• To evaluate the effects of an intervention during the 2020 US presidential election.

Main Methods:

• A large-scale field experiment was conducted on Facebook with 23,377 users.
• Exposure to like-minded content was reduced by approximately one-third for participants.
• Attitudinal measures including polarization, candidate evaluations, and belief in false claims were tracked.

Main Results:

• The intervention increased exposure to cross-cutting sources and decreased uncivil language.
• No measurable effects were found on eight preregistered attitudinal measures.
• Exposure to like-minded content is common, but reducing it did not decrease polarization.

Conclusions:

• Reducing like-minded content exposure on social media did not significantly impact user polarization.
• Social media echo chambers' role in political polarization may be less impactful than commonly assumed.
• Further research is needed to understand the complex dynamics of social media and political attitudes.