[shostack]

It also makes sense for businesses to consider them as a payment option given the reach, and if it takes off, the likelihood that a user will keep their payment details current.

Expired credit card churn is a huge issue for any successful SaaS business, and someone is much more likely to keep their payment details updated with a service they pay through regularly than they are entering one-off CC info. Adding FB to the mix with Apple, Amazon, Paypal and Google would make sense for a lot of companies (although probably entails a whole host of headaches).