Which pioneering technology company first implemented collaborative filtering for product recommendations, revolutionizing retail personalization in the 1990s?

The digital transformation of retail has been marked by groundbreaking inventions that changed how we shop forever. Personalization algorithms represent one of the most significant innovations, allowing retailers to create uniquely tailored shopping experiences. This poll tests your knowledge about the early development of retail recommendation systems that laid the foundation for today's sophisticated personalization technologies.

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Amazon with its item-to-item collaborative filtering algorithm
Firefly Network with its 'automated collaborative filtering' system
Netflix with its Cinematch recommendation engine
eBay with its 'Similar Items' feature