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The Algorithm is Twitter’s open source release of the core ranking system that powers the platform’s home timeline. It provides transparency into how tweets are selected, prioritized, and surfaced to users, reflecting Twitter’s move toward openness in recommendation algorithms. The repository contains the recommendation pipeline, which incorporates signals such as engagement, relevance, and content features, and demonstrates how they combine to form ranked outputs. Written primarily in Scala, it shows the architecture of large-scale recommendation systems, including candidate sourcing, ranking, and heuristics. While certain components (such as safety layers, spam detection, or private data) are excluded, the release provides valuable insights into the design of real-world machine learning–driven ranking systems. The project is intended as a reference for researchers, developers, and the public to study, experiment with, and better understand the mechanisms behind social media content.
Features
- Open source release of Twitter’s core recommendation algorithm
- Implements ranking pipeline including candidate sourcing and filtering
- Shows how engagement and relevance signals are used for ranking
- Written mainly in Scala with production-scale architecture patterns
- Excludes sensitive data but reveals algorithmic design principles
- Provides transparency and educational insight into recommendation systems
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