Of course, data confidentiality should come first for any company. But what do we see in reality? Mobile operators sell databases, sometimes it seems that even banks spread information about the contact information of their users. If Facebook adapts cryptocurrency payments, it will only help its rating. There previously were much info that Facebook confidentiality = zero, everyone can buy user's password, what r we gonna see if they launch crypto payment?
As far i know, facebook or others social media selling our behaviour patterns on their social media for research. But i dont think social media platform selling our personal database because it should be confidential. If facebook launch their own cryptocurrency, i think its good and could attract many investor