People preferred e-mailing articles with positive rather than negative themes, and they liked to send long articles on intellectually challenging topics.
Perhaps most of all, readers wanted to share articles that inspired awe, an emotion that the researchers investigated after noticing how many science articles made the list.
[...] the Penn researchers defined the quality as an “emotion of self-transcendence, a feeling of admiration and elevation in the face of something greater than the self.”
They used two criteria for an awe-inspiring story: Its scale is large, and it requires “mental accommodation” by forcing the reader to view the world in a different way. [...]
But in general, people who share this kind of article seem to have loftier motives than trying to impress their friends. They’re seeking emotional communion, Dr. Berger said.
Lovely.
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Justin Wolfers points out recursivity.