SNS Algorithm

x-algorithm
xai-org • Updated 2026 Jun 25 9:8

62.9% of the codebase is written in Rust and 37.1% in Python. The system consists of four major components: Home Mixer (the orchestration layer), Thunder (in-memory storage), Phoenix (ML computation), and a modular Candidate Pipeline.

Replacing existing heuristics with ML models stands out as a way to simplify the pipeline and improve performance; however, if the model relies too heavily on a user’s past engagement, it may exacerbate the “echo chamber” effect.

A modern system design showing how large-scale social media platforms use machine learning to deliver personalized experiences in ultra-low-latency (sub-millisecond) environments.

The Algorithm That Powers Your X (Twitter) Post

In this article, we will look at what the algorithm does, how its components fit together, and why the xAI Engineering Team made the design choices they did.