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Yes, 833-398-5821 / 650-543-4800 is a real Facebook phone number, and it linked to Facebook's corporate headquarters. If you need to contact Facebook, this number is often listed publicly—but don't expect it to connect you directly to a support agent. It's typically used for automated messages or identity verification
https://github.com/facebook/facebook-ios-sdk/issues/2661
https://github.com/facebook/facebook-ios-sdk/issues/2661
https://github.com/facebook/facebook-ios-sdk/issues/2661
https://github.com/facebook/facebook-ios-sdk/issues/2661