Measuring Decentralization in the Fediverse and Atmosphere
2025-08-31
This website uses the Herfindahl–Hirschman Index (HHI) to measure the concentration of user data on decentralized social networks like the Fediverse and Atmosphere. An HHI close to zero indicates high competition, while a value near 10000 signifies a highly concentrated monopoly. The site currently calculates HHI by analyzing the distribution of active users across servers (Fediverse) or data repositories (Atmosphere), aggregating servers controlled by the same entity. Beyond data location, the site highlights other crucial aspects of decentralization, including network structure, identity management, infrastructure, legal jurisdictions, and the distribution of social power. Code and data are available on GitHub.
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