Amazon.com used item to item collaborative filltering which has online computation scale independantly of number of users and number of items in catalog. Unlike traditional collaborative filtering where system finds similer set of customer who has purchased same items as current customer, amazon.com tries to find items which are similer to one that current customer has already purchased,viewed or recommended.
The entire report can be found here.
http://www.win.tue.nl/~laroyo/2L340/resources/Amazon-Recommendations.pdf
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