Which personalization technique has been proven most effective at increasing viewer retention on major streaming platforms?

The film and television industry has undergone dramatic transformation with the rise of streaming platforms and their sophisticated recommendation algorithms. These platforms have revolutionized content discovery and viewing habits through advanced consumer psychology and data analytics. How well do you understand the science behind what keeps viewers watching?

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Genre-based recommendations that suggest similar content to previously watched shows
Collaborative filtering that recommends content based on viewing patterns of similar users
Time-of-day optimization that suggests different content types based on viewing hour
Celebrity-driven suggestions that prioritize content featuring actors from previously watched shows