There's a difference between Facebook, Inc (the company whose services were down) and facebook.com (the website that this article is about, which people are saying is "over").
It wasn't just Facebook (the social media website) that was down, though; it was Facebook, Instagram and WhatsApp down (if you're keeping score, that's 3-4 of the top 10 apps for both iOS and Android, depending on how you count Messenger), a large number of services that (surprisingly to many people) turned out to depend on Facebook's services, and a general firestorm of DNS DDOS's from services trying to access Facebook.com. That turns into a large portion of the internet behaving badly, not even counting that Whatsapp is the commons on which much of the non-US world's communications are built.
Besides all that, it's unusual for such a globally major website to be down at all, much less for hours. From a reliability perspective, that ~6 hours that Facebook's systems were down sets them an upper limit of 99.93% availability for the year.
It wasn't just Facebook (the social media website) that was down, though; it was Facebook, Instagram and WhatsApp down (if you're keeping score, that's 3-4 of the top 10 apps for both iOS and Android, depending on how you count Messenger), a large number of services that (surprisingly to many people) turned out to depend on Facebook's services, and a general firestorm of DNS DDOS's from services trying to access Facebook.com. That turns into a large portion of the internet behaving badly, not even counting that Whatsapp is the commons on which much of the non-US world's communications are built.
Besides all that, it's unusual for such a globally major website to be down at all, much less for hours. From a reliability perspective, that ~6 hours that Facebook's systems were down sets them an upper limit of 99.93% availability for the year.