Reports from the public goods games seemed to show as much, says Raihani. “When you ask the teammates why they want to exclude someone, they often give ‘positional’ answers like, ‘Oh, that guy, no one's doing what he's doing – he makes us all look bad’.” Studies of social media, says Raihani, show that people tend to be less impressed by an altruistic act if the person announces the event on Facebook, for example, than if they had kept it quiet.

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