https://wccftech.com/facebook-instagram-whatsapp-and-workplace-go-down-in-massive-outage/

Over the last hour, Facebook services have gone dark over pretty much the entire world and taken down sister services like Whatsapp, Instagram and even Workplace (which Wccftech for one, uses as its primary ERP).

Considering the global nature of the outage this is most likely a DNS error at a core registry. DNS services are critical to the seamless running of the internet and many of the Internet's core infrastructure is fairly dated. While Cloudflare is almost always the central point of failure, disruptions in that are usually localized and intermittent with slowdowns affecting the websites.