🧾x-algorithm
Algorithm powering the For You feed on X
⭐ Very popular: 31k stars, gaining about 4k a week
View on GitHub ↗repo profile
momentum
durability
since we covered it
why it's a big deal
- It provides a real-world, production-grade recommendation pipeline reference instead of toy ranking examples.
- The architecture shows how retrieval and ranking can be composed into a single system with explicit stages and interfaces.
- The move away from hand-engineered features signals a shift toward transformer-first ranking as the default approach.
under the hood
- Implemented primarily in Rust with components split into Home Mixer, Thunder, Phoenix, and Candidate Pipeline crates.
- Uses a two-tower retrieval model for out-of-network discovery and a transformer ranker with candidate isolation.
- Pipeline stages include hydration, filtering, multi-action scoring, selection, and post-selection visibility filtering.
our take from PR#26, 2026-01-28
star history
- PR#26 14k 2026-01-28
- now 31k + 17k since first covered
curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.
understory
Better known than its recent output, coasting a little on attention.
- output, commits & releases
- clout, star velocity
output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →
covered in
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Open source “For You” feed recommendation system
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