Facebook News today rolled out across the UK, and the social network marked the launch by revealing new details on how algorithms power the feature. In a blog post, Facebook said the ranking system isn’t comprised of a single algorithm. Instead, it uses multiple layers of machine learning models to predict what a user wants to see. Facebook explained how this would work for a fictional user called Juan: Since Juan’s login yesterday, his friend Wei posted a photo of his cocker spaniel. Another friend, Saanvi, posted a video from her morning run. His favorite Page published an interesting article about the best way…

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