Modernizing the Facebook Groups Search to Unlock the Power of Community Knowledge

Facebook modernized Groups Search with a hybrid retrieval combining keyword and semantic matching.

• •Parallel retrieval: Unicorn inverted index for exact matches and SSR semantic model with Faiss for conceptual similarity
• •MTML ranking merges lexical and semantic features, optimizing for clicks, shares, and comments
• •Llama 3 automated evaluation detects nuanced relevance beyond binary judgments
• •Addressed discovery, consumption, and validation friction points in community knowledge search
• •Achieved improved engagement without sacrificing precision

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