one technique of Personalization, based on taking one user's preference/rating (Product Review) data and finding other people with "similar" taste
Apr'2014: Today, we’re announcing General Availability for the Mortar Recommendation Engine. Designed by Mortar’s engineers and top Data Science advisors, it produces personalized recommendations at scale for companies like MTV, Comedy Central, Stub Hub, and the Associated Press. Today, we’re giving it away for free, and it is awesome. Built on Hadoop and pig.
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