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Recommending Friends With MapReduce and Python

Marcel Caraciolo describes the MapReduce-based friends recommendation engine:

That’s a simple algorithm used at Atépassar for recommending friends using some basic graph analysis concepts.

Considering the network only has 140k users, the first question that came to my mind was why MapReduce and not a graph database?

Original title and link: Recommending Friends With MapReduce and Python (NoSQL database©myNoSQL)