This is one part of the UCS taxonomy chart with examples of UCS's that aggregates information about what people buy.

iTunes Genius

iTunes gathers information from individual iTunes users, and uses that to create playlists and purchasing recommendations.

• An In-Depth Look at iTunes Genius
• iTunes 8: The Genius in the Box
• My iTunes Genius is a Moron

Netflix

Netflix is the largest online DVD rental service, offering flat rate rental-by-mail and online streaming to customers in the United States. Netflix developed and maintains an extensive personalized video-recommendation system based on ratings and reviews by its customers, similar to the system used by Amazon.com.

• Netflix (Company website)
• Netflix Prize

Example (make a link)

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