Yes, security researchers have reached FB servers in the past few months.
> Has Google ever been hacked to this degree?
Yes, by Mainland Chinese agents a few years ago.
I know of similarly large networks that are currently owned.
And almost everybody has an IPMI problem, whether they realize it or not yet.
(Silicon Valley engineer here.)
[1] https://en.wikipedia.org/wiki/Intelligent_Platform_Managemen...
Let's say you have a server, reachable on a certain network address on a LAN.
I can turn on AMT, I can set up server management answerable at the SAME address. network traffic to and from the machine and network is undisturbed.
I can install bios updates, configure aspects of the machine, all kinds of things, just with AMT. I have read in some cases you can configure the machine this way even if its powered off.