404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=AFqz5HozT4dRutL1XUOEhTFLfse_irxwNV_hqQshRittwTeFm9RWR-n6KRen_SS0xGqoXA4su-d5FIAwmjzCUZThh8xUq_-mvU5gVq9AyZrquWns0_bxsiYdcKPjZ3yT
was not found on this server. That’s all we know.