Elon Musk has made the announcement that X Platform has formally open-sourced its core recommendation algorithm, named "For You". This algorithm is built upon the same Transformer architecture as the Grok model developed by xAI. It moves away from the manual rules that traditional recommendation systems rely on, and instead, depends entirely on the model to analyze users' interaction histories. Through this analysis, it automatically gauges the relevance of content. The recommendation process unfolds in two main stages: recall and scoring. The final score is arrived at by conducting a weighted computation of various action probabilities that the model predicts. The system is equipped with rigorous filters both before and after the scoring process and also integrates an author diversity mechanism to ensure a well-rounded content selection. The open-source version encompasses the core recommendation logic, a candidate processing pipeline crafted in Rust, and comprehensive architectural documentation. Musk has pledged that future enhancements will be driven by community feedback, with an open-source update cycle scheduled every four weeks, ensuring continuous improvement and community involvement.