Which technology first enabled widespread personalized product recommendations in e-commerce, fundamentally changing how online stores marketed products to individual shoppers?

Test your knowledge about the technological milestones that transformed online retail from simple digital catalogs to sophisticated personalized shopping experiences. The way e-commerce platforms analyze customer behavior and preferences has revolutionized how products are marketed and sold online. Do you know which innovation truly changed the game for personalization in e-commerce?

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Collaborative filtering algorithms developed by Amazon in the late 1990s
Facebook's Open Graph Protocol introduced in 2010
Google's AdSense contextual advertising launched in 2003
Apple's iBeacon technology for retail stores released in 2013