https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-decentralized-federated-social-2026-mastodon-bluesky-nostr-lemmy-pixelfed-peertube-misskey-sharkey-threads-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-decentralized-federated-social-2026-mastodon-bluesky-nostr-lemmy-pixelfed-peertube-misskey-sharkey-threads-deep-dive.en The social-network map of 2026 can no longer be drawn as "Twitter, Facebook, Instagram." Twitter became X, and the people who left scattered across three different protocols — Mastodon, Bluesky, and Nostr. The Reddit IPO and the 2023 API price hike grew Lemmy and Mbin. Pixelfed fills the Instagram gap, PeerTube the YouTube gap, and Meta's Threads is slowly joining ActivityPub through 2024-25. In Japan, Misskey.io is now the single largest Fediverse instance, while Sharkey and Iceshrimp.NET inherit its fork ecosystem. Calckey/Firefish died in 2024. This article walks the entire decentralized-social map of 2026 in one sitting: the three protocols (ActivityPub / AT Protocol / Nostr), each network's founder, scale, current state, and who should pick what. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) decentralized-socialfediversemastodonblueskyat-protocolnostrdamusamethystlemmypixelfedpeertubefriendicamisskeysharkeyiceshrimpfirefish-rippleromaakkomambinkbindiasporaelementmatrixthreadsactivitypubw3c2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-decentralized-federated-social-2026-mastodon-bluesky-nostr-lemmy-pixelfed-peertube-misskey-sharkey-threads-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-decentralized-federated-social-2026-mastodon-bluesky-nostr-lemmy-pixelfed-peertube-misskey-sharkey-threads-deep-dive.ja 2026年のソーシャルネットワーク地図は、もはや「Twitter、Facebook、Instagram」だけでは描けない。TwitterはXとなり、離れた人々はMastodon、Bluesky、Nostrという3つの異なるプロトコルへと散らばった。Reddit IPOと2023年のAPI価格改定はLemmyとMbinを育て、InstagramのオルタナティブはPixelfedが、YouTubeのオルタナティブはPeerTubeが埋めている。MetaのThreadsは2024-25年にかけて少しずつActivityPubに合流しつつある。日本ではMisskey.ioが単一Fediverseインスタンス最大となり、SharkeyとIceshrimp.NETがそのフォーク生態系を引き継いだ。Calckey/Firefishは2024年に消えた。本稿はActivityPub・AT Protocol・Nostrの3プロトコルの違いから、各ネットワークの創設者・規模・現在地・誰が選ぶべきかまで、2026年の分散型ソーシャル地図全体を一気に整理する。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) decentralized-socialfediversemastodonblueskyat-protocolnostrdamusamethystlemmypixelfedpeertubefriendicamisskeysharkeyiceshrimpfirefish-rippleromaakkomambinkbindiasporaelementmatrixthreadsactivitypubw3c2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-decentralized-federated-social-2026-mastodon-bluesky-nostr-lemmy-pixelfed-peertube-misskey-sharkey-threads-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-decentralized-federated-social-2026-mastodon-bluesky-nostr-lemmy-pixelfed-peertube-misskey-sharkey-threads-deep-dive 2026년의 소셜 네트워크 지도는 더 이상 "Twitter, Facebook, Instagram"으로 그릴 수 없다. Twitter는 X가 되어 떠난 사람들이 Mastodon, Bluesky, Nostr라는 세 개의 다른 프로토콜로 흩어졌고, Reddit IPO와 API 가격 인상은 Lemmy와 Mbin을 키웠다. Instagram의 대안은 Pixelfed가, YouTube의 대안은 PeerTube가 채우고 있고, Meta의 Threads는 2024-25년 사이에 천천히 ActivityPub로 합류하고 있다. 일본에서는 Misskey.io가 가장 큰 단일 Fediverse 인스턴스로 자리 잡았고, Sharkey와 Iceshrimp.NET이 그 포크 생태계를 이어받았다. Calckey/Firefish는 2024년에 사라졌다. 이 글은 ActivityPub · AT Protocol · Nostr 세 프로토콜의 차이부터, 각 네트워크의 창립자/규모/현재 상태/누가 골라야 하는지까지 — 2026년 탈중앙 소셜의 전체 지도를 한 호흡으로 정리한다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) decentralized-socialfediversemastodonblueskyat-protocolnostrdamusamethystlemmypixelfedpeertubefriendicamisskeysharkeyiceshrimpfirefish-rippleromaakkomambinkbindiasporaelementmatrixthreadsactivitypubw3c2026deep-dive