https://www.reuters.com/article/facebook-outages/facebook-blames-faulty-configuration-change-for-nearly-six-hour-outage-idUSKBN2GU1TV

(Reuters) -Facebook Inc blamed a "faulty configuration change" for a nearly six-hour outage on Monday that prevented the company's 3.5 billion users from accessing its social media and messaging services such as WhatsApp, Instagram and Messenger.