[Musk: X Updates Timeline Recommendation Model, Emphasizing User Dwell Time and Complete Reading] Musk posted on X stating that the platform's timeline recommendations have undergone two significant adjustments: the new AI ranking model can more accurately predict potential user dwell time; the retrieval model has been trained to recommend posts that users are likely to read in full. He also mentioned that active usage time by X users is growing exponentially, almost setting historical records every day.