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?
What else are you expecting from Facebook?They are a social network.Their biggest asset is the personal data of all their users.Of course they are going to sell it.

Too sad that they are going to create their own coin,instead of adopting btc,eth or litecoin.