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Facebook's collection of user data is unethical
Facebook is making public data available on an equitable basis. If this data was not available, only Facebook would have access to it and as such only Facebook would be able to benefit from it.
Without the API's to access data, Facebook would become even more of a walled-garden, and would grow in power even more.
Facebook is not making its data available on an equitable (i.e. appropriately open & ethical) basis. If it did it would be better for everyone.