I'm definitely not gonna trust FB with credit card or anything private. It is a company built on sharing, with repeated history of privacy issues. It's one thing posting there about my vacation and what I think of latest Hollywood blockbuster and quite another to give them a line to my bank account. For the latter I would rather have some company that has better privacy traditions.
Precisely. The ethos of the Facebook notion of sharing and privacy is antithetical to what a financial service needs to have.
One big reason I trust Paypal for everyday transactions is because they make money off of each transaction directly, whether through direct fees or merchant fees. I can understand their business model, and the service has a certain simplicity.
The OP wants me to give financial data to a company where my data is their product, and who is always trying to prise more "openness" from me through a byzantine privacy UI and borderline surreptitious app installations? I'll pass, thanks.