No. For all users within EU it must follow the GDPR. If you are a US citizen and access FB from EU, they must follow the GDPR, as far as I understand it.
And being FB, they really do not have a choice, since the EU do have leverage over them because they're doing business here.
I live in the EU. If I'm your "customer" (as in, you store my personally identifiable data), you have to comply with GDPR, regardless of where your company is.
And being FB, they really do not have a choice, since the EU do have leverage over them because they're doing business here.