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Notes · Other Peoples' Talks · FOSDEM 2026 · AT - The Billion-Edge Open Social Graph

https://fosdem.org/2026/schedule/event/ZT7TB9-at-the-billion-edge-social-graph/

  • Improving documentation
  • Not just building higher-level abstractions, but improving the low-level documentations
  • PDSes host accounts; if you don't run one, you'll end up on a Bsky-hosted PDS
    • PDS self-hosting is well documented
    • All it really has to do is host your local data
    • Also added deploy-recipes
  • The firehose is how you get information from the network; it is just the websocket
    • Getting the Twitter firehose was very irritating in 2020i
  • Can use websocat to listen to the firehose
  • One of the core ideas is that you can backfill the entire network with enough time and hard drive space
    • About 30 TB of space to store the Bluesky posts, but other things on the protocol are much smaller
  • Dealing with older data was irritating, but tap makes it easier (ATProto-specific application, not the generic application)
    • Can use it to consume from the firehose
  • graze.social is a useful way of building custom feeds
  • Microcosm is an effective way of interacting with the AT Protocol
    • Constellation offers an interface for querying all of the links in the protocol - and everything is a link
  • pdsls
  • XRPC is a thin layer over HTTPS
    • Records are stored as they're sent; there's no magic transformation
  • Leaflet
  • anisota
  • Can mix existing lexicons with new lexicons, as anisota does
  • Dan Abramov posts about ATProto / mounting posts via FUSE
  • Bridgyfed connects Fediverse and ATProto