The banks are doing things, perhaps not exactly what was described, but your facebook history, linkedin, other social media accounts are taken into account when applying for a loan. Even when you browse the bank's web page, where you hover the mouse, what pages you look at and variour other metrics. One example of a company providing such service is http://www.bigdatascoring.com/
In my opinion that is a very good thing. If they can make fewer loans to people who are high risk and lower interest loans to people who are not, everyone wins. The source of the data doesn't matter.
