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> I would be interested to know how often Facebook analyzes this data and actually fires people for improper usage.

From the article: Facebook fired 52 people from 2014 to August 2015 for abusing access to user data

The article does mention more than 50 people being fired for it between 2014 and Aug 2015

I don’t have proof, but we were told that every access of sensitive data was actively audited. It’s very rare to need to do this for your job, so I don’t imagine it’s a huge volume of events to be audited.