Ad Click Prediction on Social Platform

Let me walk you through how I'd design an ad click prediction system at production scale. I'll go stage by stage — business and ML objectives, high-level design, data and feature strategy, embeddings, pipeline architecture including modeling and training details, infrastructure, evaluation, and robustness. I'll pay special attention to the unique aspects of ads: they can be shown multiple times, generate equal revenue per click, and require continual learning as ad campaigns evolve.