X exec says new AI ranking model lifted engagement 42% YoY by predicting time spent
nikitabier · x · 2026-10-20
X executive Nikita Bier told Elon Musk the timeline recommendation system got two key upgrades: a new AI ranking model that predicts probable time spent much better, and a retrieval model trained to surface posts people read all the way through. He adds that user active seconds are growing exponentially, hitting all-time highs almost daily, with engagement up 42% year over year.
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