I don't trust Facebook with my KYC details but I guess Facebook has already known a few personal data of mine. Facebook holds a lot of personal data of its users around the world.

However, if you are referring to Libra, I have to tell you that it is not Facebook. Libra may have been initiated by Facebook but Facebook does not have the sole control over it. As a matter of fact, the Libra Association which overlooks the operation of the Libra Project is composed of many members, of which Facebook is only one. Thus it has also a single vote in decision-making concerns.

As to now, I cannot tell whether it will be successful or not. But if it is successfully launched, it will definitely achieve a good level of success considering its many institutional partners.