[rootinier]

nslookup www.facebook.com 8.8.8.8 Server: 8.8.8.8 Address: 8.8.8.8#53

* server can't find www.facebook.com: SERVFAIL

[aduitsis]

  dig +trace messenger.com

shows that all is well with the root DNS servers and

  dig @a.ns.facebook.com messenger.com
  ;; connection timed out; no servers could be reached

and also

  ping a.ns.facebook.com
  3 packets transmitted, 0 packets received, 100.0% packet loss

shows that something's wrong with facebook.