Does Facebook run their own servers?

Excuse me, could you clarify something for me? The paragraph mentions "Does Facebook run their own servers?" Now, I'm wondering if Facebook indeed maintains and operates their own servers to support their vast network and the multitude of services they offer to their users? Is there any information or documentation that confirms this? And if so, does this give them a significant advantage in terms of control, scalability, and security over other platforms that might rely on third-party hosting services?