So it seems the Facebook issues have to do with bad BGP (border gateway protocol) updates. Their domain is served by nameservers on their own domains (presumably using glue records), so a whois request currently fails. This also might be why every registrar says the name is available.
This isn't the first time this has happened. I swear there is at least one BGP global outage a year at this point. Securing the way IP routes over the world is a fucking joke.