Which groundbreaking personalization feature did Spotify introduce in 2015 that fundamentally changed how streaming services recommend music?

Music streaming platforms use sophisticated algorithms to personalize recommendations for listeners. These retail personalization systems analyze your listening habits, preferences, and even the time of day you listen to create the perfect playlist. How well do you understand the technology behind your favorite music streaming service? Test your knowledge about the data-driven approach that's revolutionizing how we discover music!

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• Discover Weekly - algorithmic personalized playlists refreshed every Monday based on user listening patterns
• Collaborative Filtering - using other users' preferences to make recommendations
• Acoustic Analysis - categorizing songs by their audio characteristics like tempo and energy
• Social Graph Integration - recommendations based on what friends are listening to

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