Behind X's algorithm is the engineering work of the xAI team. They completely rebuilt the system from scratch and pushed it to 20K GPUs operating at Colossus—a significant infrastructure undertaking. The results speak for themselves: time spent on the platform jumped 20%, with engagement metrics climbing even higher. The algorithm's scale is impressive too. Every single day, Grok processes over 100 million posts to serve personalized content feeds. That's the kind of computational horsepower needed to keep users scrolling and engaged in a competitive attention economy.