They do have interesting infrastructure v6 prefixes too.

>> snip <<

   5  be2.bb01.iad3.tfbnw.net (2620:0:1cff:dead:beef::6b8)  37.323 ms  37.332 ms  37.326 ms
   6  be13.bb02.frc3.tfbnw.net (2620:0:1cff:dead:beef::16c0)  37.669 ms  27.980 ms  27.878 ms
   7  ae61.dr02.frc3.tfbnw.net (2620:0:1cff:dead:beef::653)  27.525 ms  25.989 ms  25.871 ms
   8  po1022.csw07c.frc3.tfbnw.net (2620:0:1cff:dead:beef::1b75)  26.741 ms  27.965 ms  27.875 ms
   9  * * *
   10  edge-star6-shv-07-frc3.facebook.com  (2a03:2880:2130:7f07:face:b00c:0:1)  25.823 ms  24.916 ms  24.799 ms