As a counterexample of your “nut case” hypothesis, in anti money laundering, now, across the globe, a bank not having enough profiling information about you is deemed a red flag, and assigns you more risk - that may rise to the point that they close your accounts or that your assets may be frozen proactively by the bank without a judge, or the police for that matter, to opine in the freeze.

Not many banks use facebook as a datapoint but mobile phone and address? Par for the course. And this is going to increase with fraud and aml converging.