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John Udell has written a program (no code published yet) for collaborative filtering with His program first finds people that he has many links in common with, and then reads in all their links into one file. Then it looks in that file to see which links are popular and serves those up. It is kind of like applied only to people you have links in common with. I feared that as got more and more popular, people would start to spam it and the majority will start to bookmark more and more banal things like Britney Spears et al.. However, with tools like this, has the potential to get even more useful to me.

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