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Facebook only has IPv4 at the edge. Everything internal is IPv6.

suggests that ipv6 is here to replace the rfc1918 space but "the internet" largely remains ipv4.

the high v6 penetration in mobile networks likewise suggests that smartphones are generally not a part of the network as much as dedicated leaf nodes that require no inbound connections.

There's a difference between "IPv4 is only present at the edge" and "only IPv4 is present at the edge".

I think Facebook is doing IPv4+IPv6 at the edge, and IPv6-only internally.

You are correct. Facebook has done multiple presentations where they showed how they have a IPv4 load balancers/translation layer at the edge that converts everything to IPv6... but native IPv6 is well, just that, native.

There's no translation layer needed.

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