Given the rise in the sharing economy, the effect of tangible assistance on community participation is a relevant topic. Using the social media site Reddit.com's sub forum Random Acts of Pizza, we investigate the effect of the receipt of altruism in the form of tangible goods rather than information or intangible assistance. We find evidence that the receipt of tangible assistance increases the normative adherence of users, the amount of participation, and the breadth of participation across the wider site.
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