By Entrepreneur en Español Facebook, Instagram, WhatsApp, and Messenger on Monday suffered the longest of their service interruptions on record, a drop that affected millions of users around the world. Why Did Facebook, Instagram, WhatsApp, and Messenger Go Down? It’s not uncommon for Facebook to have localized outages, but with nearly 3 billion monthly users, it is unusual that it has global “blackouts.” According to the Ars Technica site, significant DNS flaws were found on Facebook. The Domain Name System is the service that translates human-readable host names (like Entrepreneur.com) to raw numeric IP addresses (like 19.223.456.245). Without a functional DNS, a computer basically does not know how to reach the servers that host the website it is looking for. However, the site mentions that Instagram also went down and its DNS services, which are hosted on Amazon, were functional. So at the moment we only have many theories and …