[Rails] Having some issues on backend regarding a social networking project on ROR

I am working on a social networking project. I need to store about 10-15 user profile information like movies,music,books,relationship-status and so on. I am confused about which database should i use to store user profile info. There are NOSQL solutions like MONGODB as well as Neo4j(graph). Or should i store it in relational database like mysql. Needless to say, but the solution should be scalable and efficient. Any guidance on this would be of great help. 

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