COSCUP 2026 - Conference for Open Source Coders, Users, and Promoters

The Fediverse has grown into a globally distributed network of independent servers, yet its expansion is not merely a technical achievement—it is a cultural one. In Japan, the adoption of decentralized social protocols like ActivityPub has been deeply intertwined with the country's long-standing open-source software (OSS) culture, Linux user groups, and maker communities. This talk explores how Japan's Fediverse has evolved, the unique challenges it faces, and how community-driven initiatives like the Fediverse Linux Users Group (FediLUG) are shaping its future.

Founded in 2023, FediLUG emerged from a simple observation: instance operators in Japan were highly skilled technically but often isolated in their stewardship roles. Unlike Western ecosystems where large organizations or well-funded nonprofits often back Fediverse projects, Japan's scene relies heavily on volunteers running small-to-mid-sized instances. FediLUG was created to bridge this gap by fostering knowledge sharing, providing operational support, and building a sustainable community around decentralized social networking. Through workshops at major OSS conferences, hands-on meetups, and open documentation initiatives, we have been cultivating a space where technical expertise meets long-term community stewardship.

This session will walk you through FediLUG's activities and the insights gained from supporting Japan's Fediverse landscape. We will cover practical topics such as onboarding new operators, implementing scalable moderation policies, and maintaining healthy federation relationships in a multilingual, multi-cultural environment. Beyond operations, we will examine the governance and social dimensions of running decentralized networks. Drawing from a culturalist perspective on technology, I will discuss how valuing human effort, dialogue, and shared responsibility can lead to more resilient communities than purely protocol-driven or market-driven models.

The Japanese Fediverse also presents unique structural characteristics: a high density of niche, hobby-driven instances; strong ties to traditional Linux and BSD communities; and a growing emphasis on interoperability and data portability. These traits offer valuable lessons for global Fediverse builders, particularly around sustainability without corporate backing, balancing decentralization with usability, and fostering cross-cultural collaboration in East Asian OSS ecosystems.

Attendees will leave with actionable strategies for community building, moderation at scale, and long-term instance sustainability. Whether you are an ActivityPub implementer, an instance operator, or simply interested in how decentralized networks shape social behavior, this talk will provide a grounded, community-first perspective on the future of the social web.