02-02-08 - 3

If recommender systems like Netflix were augmented with a Network of Trust, one thing you would want is to remember where you got the recommendation from. That way when I watch a movie that was highly recommended for me, and I hate it, I can go back and see the link that recommended it for me and mark it as "don't trust" (for movies). In theory a simple collaborative filtering system will eventually learn your similarity with everyone else in the system, but in practice you have to have a very large # of movies in common before that becomes accurate, far more than normal people watch. If you allow the user to provide extra information you can converge on their tastes much faster.

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old rants