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Do people believe a news story more if it is shared by a friend? Should they? I investigate this using experiments in India with 800 pairs of friends and a custom social-media platform. I find sharers can distinguish true from false stories but share both equally, making sharing uninformative about a story's truth. Receivers, however, interpret sharing as a sign of truth: they overestimate how well sharers’ beliefs predict veracity; discount how factors besides belief influence sharing decisions; and update the most on stories they least believed initially. Altogether, stories gain (unmerited) credibility from being shared by a friend
Jimmy Narang (Fri,) studied this question.