AI BriefingRunning Bluesky's For You Feed
Key point
Bluesky's For You feed runs on a single Go server and SQLite sitting in a living room.
Details
The For You feed on Bluesky, run by spacecowboy, is a custom recommendation feed used by about 70,000 people. Recommendations work on a likes-based approach, looking at what else people who liked the same post also liked.
The setup is surprisingly simple.
- The backend runs on a single Go process and SQLite in a living room.
- The server is a gaming PC with 16 cores, 96GB RAM, and 4TB NVMe.
- It ingests the Bluesky firehose to store relevant data, keeping only the most recent 90 days.
- The current SQLite storage is about 419GB.
External traffic is handled by a $7/month VPS on OVH, connected to the living-room server via Tailscale. Total cost comes to about $30/month, combining $20 in electricity, $7 for the VPS, and $3 for the domain, and spacecowboy believes this setup could handle up to about 1 million DAU if using the cheapest algorithm.
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