As lines blur between industries, between B2C and B2B markets, and between platforms and non-platform firms, Internet-era information is driving an unprecedented rate of economic change mediated by platform partnerships. This community creates value for ecosystem partners as users create value for one another. These “network effects” enable organizations to scale value outside the firm rapidly through third parties, creating a feedback loop that devastates competitors. Understand why it is easier to add a technology to a community than to add a community to a technology; why it matters and what is at stake.