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From their site: The Criteo predictive engine is a powerful tool that analyses consumer behavior and provide them with relevant product recommendations. The Criteo Quick-Start API allows you to start with recommendations on your web-site with a simplified but complete set of functions. Criteo technology is based on collaborative predictive analysis.
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Criteo is not only a funny web site to find out unknown or forgotten movies. They also provide a web-service API that allow anyone to implement recommendations and community features very simply. Their powerful techno is to be used by several french portal, merchands. And it seems that a public version of the API will be issued soon.