404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=GYxuGvSNVCo1MxYln1dEQybbc1hA9MpUWbMUO-l_7lO6KVdNT8781xpvBU1WR2JCsZw1kB-G1aYA95UaQ-pqysfF-ox8WorMaLPZlvFmyOkZKtQWJYRgYiY7LoUEJZbw
was not found on this server. That’s all we know.