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The page speaks a lot about how this method is great compared to regular collaborative filtering performance-wise, but doesn't really explain how the methodology and implementation differs concretely. — Preceding unsigned comment added by 7804j ( talk • contribs) 11:19, 7 June 2016 (UTC) reply

I think there is a mistake regarding the authors of the mentioned papers. It it said, that Item-item collaborative filtering was invented by Amazon in 1998, but as authors of the paper are mentioned: Badrul Sarwar, George Karypis, Joseph Konstan, and John Riedl. But they are the authors of another paper (2001) about item-item collaborative filtering. Greg Linden (the one from the first paper 1998, Amazon employee) explained the history of all papers here: http://glinden.blogspot.com/2006/11/item-to-item-collaborative-filtering.html