There is more stuff around, but here are some Internal use (2011) http://www.pcworld.com/article/245848/usenix_google_deploys_ipv6_for_internal_network.html ht

There is more stuff around, but here are some Internal use (2011) http://www.pcworld.com/article/245848/usenix_google_deploys_ipv6_for_internal_network.html http://www.pcworld.com/article/245848/usenix_google_deploys_... Internal and some datacentres (2009) http://www.networkworld.com/article/2238936/lan-wan/google-adding-ipv6-to-youtube.html http://www.networkworld.com/article/2238936/lan-wan/google-a... Backbone dual stack (2010) https://www.nanog.org/meetings/nanog49/presentations/IPv6atGoogle.pdf https://www.nanog.org/meetings/nanog49/presentations/IPv6atG... Facebook internal ipv6 http://www.internetsociety.org/deploy360/wp-content/uploads/2014/04/WorldIPv6Congress-IPv6_LH-v2.pdf http://www.internetsociety.org/deploy360/wp-content/uploads/...