Facebook's Middle Mile Infrastructure

Fri Dec 13 10:00:10 UTC 2019

Here's a short outline: 
https://connectivity.fb.com/news/fiber-optic-cable/

"We will be investing in new long-haul fiber to allow direct 
connectivity between our data centers in Ohio, Virginia, and North 
Carolina."
[...]
"We will reserve a portion for our own use and make the excess available 
to others. This means you’ll start to see a Facebook subsidiary, Middle 
Mile Infrastructure, operating as a wholesale provider (or, where 
necessary, as a telecommunications carrier)."