Facebook down: three hours and counting

I’ve been surprised to not see any articles on the subject all this time, but since at least 5am this morning and continuing to this present moment, Facebook has been unavailable. The login message says the site is down for “required maintenance,” which is polite tech speech for:

“Holy shit! Holy shit! Holy shit!!”

This is the second such outage in a week, though the last one merely slowed the site down to a crawl for most of us. This is quite a bit worse. What’s going on over there?

UPDATE: After nine hours of waiting, I’m finally able to get back onto Facebook.