A bunch of Facebook networks has disappeared from the internet.

This is the facebook.com authoritative setup: 2 DNS have disappeared from the global internet routing table, the other 2 are otherwise unreachable.

Heard FB employees are unable to enter buildings to begin to evaluate extent of outage because their badges weren’t working to access doors.

IMO this is the most sweetest thing I think I've ever heard. Facebooks door locks are IOT and rely on internet and dns - and because bgp routes took out all their dns, the door locks don't work anymore.
So if today isn't a really really good example of "hey if you don't ABSOLUTELY HAVE TO PUT IT ONLINE, maybe don't put it online". Not EVERYTHING has to be cloud-enabled. Not EVERYTHING has to phone home.

Take a breath internet. Facebook cant track you across the entire internet for however long this outage is.
for a brief few hours, "do not track" is actually working xD

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