- The document discusses GlobalInferencer, a system that links personal content shared across social platforms with public data on the web to enable inferences about a user's behavior and beliefs. - It outlines challenges with data inferencing including inappropriate inferences due to lack of complete context or information being used out of context. - The document describes GlobalInferencer's architecture and provides scenarios where a health insurance company and employer use it to learn about a person named Danny, highlighting the need to understand user policies and data context/provenance for appropriate use.