2026-07-09 –, Linden Theater
Christine Lemmer Webber is lead author and co-editor of the W3C ActivityPub specification. Daniel Holmgren is Head of Protocol at Bluesky, working on the AT Protocol specification at the IETF. Join us for a discussion on decentralization trade-offs and other design decisions in the two protocols, and what that means for different architectures, structures, and even future points of convergence.
Moderated by Boris Mann
For background check out this recent article with very useful concept drawings:
- There are no instances in atproto by Dan Abramov
Also, the articles that started the conversation:
- How Decentralized is Bluesky? by Christine Lemmer-Webber
- Reply on Bluesky & Decentralization by Bryan Newbold
- Re: Re on Bluesky & Decentralization by Christine Lemmer-Webber
Boris is a technologist and community builder. He currently splits his time between Ink & Switch's local-first & malleable software focus, and supporting the growth of open social ecosystems. Boris founded the AT Community Fund and ran the last two Atmosphere Conferences, as well as helping found CoSocial, a co-op for open social for Canadians.
He lives in Vancouver, Canada, where he is part of several groups including a creative coworking studio Z-Space and DWebYVR. You can find out more on his website https://bmannconsulting.com
Daniel Holmgren is Head of Protocol at Bluesky, where he leads the design and development of the AT Protocol. He's worked in the DWeb space for eight years, previously founding a startup for p2p collaboration on scientific data, then serving as the founding engineer at Fission, where he built an in-browser framework for user-controlled data.
Christine has devoted her life to advancing user freedom. Realizing that the federated social web was fractured by a variety of incompatible protocols, she co-authored and shepherded ActivityPub's standardization. She has also contributed to many other free and open source projects, including co-founding MediaGoblin. Christine established the open source Spritely Project to solve known problems in existing centralized and decentralized social media platforms and to re-imagine the way we build networked applications - work that now continues here at the institute under her guidance as Executive Director.
