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Has the introduction of social media into the information landscape changed the heuristics individuals use when selecting news? Social media allow users to easily share and endorse political content. These features facilitate personal influence, possibly increasing the salience of partisan information, making users more likely to read endorsed content. To test this possibility, I utilize snowball sampling to conduct a survey experiment featuring mock Facebook News Feeds. These feeds contain different levels of social media activity attributed to different sources, varying from fictional individuals to subjects’ own friends and family members. I find that online endorsements and discussions serve as heuristics when deciding which content to consume, outweighing partisan selectivity. This effect is only significant when the activity comes from friends or family members, as social influence attributed to fictional individuals has no effect on information selectivity.
Nicolas Anspach (2017) studied this question.