Which technology first enabled major e-commerce platforms to implement sophisticated product recommendation engines at scale in the early 2000s?

Test your knowledge about the technological evolution of e-commerce platforms! The e-commerce landscape has transformed dramatically over the past few decades, with various technologies and innovations reshaping how consumers shop online. This trivia question focuses on a pivotal technological advancement that revolutionized product discovery and personalization in online shopping experiences.

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Collaborative filtering algorithms
Blockchain-based user tracking
Augmented reality visualization
Voice recognition technology