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A comment on Why You Should Never Use MongoDB.
A social network will have a lot of relations -- so you should use a relational database.
Other web apps may not need as many relations (most mobile apps), in which mongodb is a superior solution
http://en.wikipedia.org/wiki/Relational_algebra
A social network will have a lot of relations -- so you should use a relational database.
Other web apps may not need as many relations (most mobile apps), in which mongodb is a superior solution