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Markets can govern behavior through the use of mechanism design and various incentives—not money alone, but the trifecta of human motivations that may be summarized as fun, fame, and fortune. In fact, on many platforms, money is far less important than the more intangible, subjective form of value known as social currency. The idea behind social currency is to give something in order to get something. If you give fun in a photo, you can get people to share it. Social currency, measured as the economic value of a relationship, includes favorites and shares.39 It also includes the reputation a person builds up for good interactions on eBay, good news posts on Reddit, or good answers on Stack Overflow. It includes the number of followers a user attracts on Twitter and the number of skill endorsements she garners on LinkedIn.
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Geoffrey G. Parker (Platform Revolution: How Networked Markets Are Transforming the Economy and How to Make Them Work for You: How Networked Markets Are Transforming the Economy―and How to Make Them Work for You)