GDPR doesn't differentiate by citizenship. However it applies if the company is in the EU (which Facebook Ireland Ltd is, and (AFAIK) all non-USA & non-Canadian

GDPR doesn't differentiate by citizenship. However it applies if the company is in the EU (which Facebook Ireland Ltd is, and (AFAIK) all non-USA & non-Canadian citizens have a contract with them), or if the person is in the EU.