Which company first implemented the collaborative filtering algorithm that revolutionized retail personalization with the famous phrase 'Customers who bought this also bought...'?

The retail landscape has been transformed by personalization technologies that analyze customer behavior to deliver customized experiences. These algorithms have become central to how modern retailers compete for customer loyalty and drive sales growth. Test your knowledge about a pivotal moment in retail personalization history that changed how we shop online forever.

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Amazon
eBay
Walmart
Netflix