Design a scalable machine learning system to detect fake news in real-time.
Instruction: Outline the architecture of the system, including data sources, preprocessing steps, model selection, and how the system scales with an increasing amount of data.
Context: This question assesses the candidate's ability to design complex, scalable systems that can handle real-time data processing and analysis, focusing on a timely and socially relevant problem.
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I would design this as a multi-stage trust and review system, not a single classifier that claims to know truth instantly...