Are there any papers regarding the recommendation algorithms behind IMDB service?

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Viktor Dmitriyev

This is not an direct answer to your question, however, I hope provided information can be interesting for you.It's about building movie rating on sentiment analysis of twits.

"Real-time sentiment rating of movies on SAP HANA One" by Wenjun Zhou:

- http://scn.sap.com/community/developer-center/hana/blog/2013/06/19/real-time-sentiment-rating-of-movies-on-sap-hana-one

- https://www.brighttalk.com/webcast/9727/82203

Jeevanandam Jotheeswaran

Alternatively you shall try to communicate with Bing Liu of University of Illinois, chicaco who has done a reasonable work on sentiments.