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Facebook's collection of user data is unethical
The FB business model (of profiling users and selling ads) is industry standard within the tech world
This allows advertising to be more targeted and therefore more relevant and useful in comparison to mass-market, blanket advertising.
While this practice is widespread among technology companies, there are exceptions, such as Apple, Duckduckgo and IBM Quad9.
Being a standard does not make it ethical. Slavery has been the industry standard, from time to time, but is not considered ethical.