X Recommendation Algorithm: Social media content recommendation system

X Recommendation Algorithm is a distributed system of services and machine learning models that generates personalized content feeds for X's platform. The architecture combines multiple candidate sources including search indexes, graph-based traversals, and user interaction data, which are then processed through light and heavy ranking models. The system uses various ML frameworks including neural networks for ranking, graph embeddings (SimClusters, TwHIN), and real-time streaming processors for user actions. It serves the For You Timeline and Recommended Notifications by coordinating data processing, model inference, and content filtering across multiple microservices.