When will Facebook, WhatsApp, Instagram come live again?

A prolonged, global outage of Facebook’s apps has the company’s engineers scrambling to fix the issue at one of its data centers in California, according to two people familiar with the situation.

The outage, which began around 11:40AM ET on Monday, has brought down all of Facebook’s apps — including Instagram and WhatsApp — globally, affecting billions of users and millions of advertisers. Inside Facebook, the outage has also broken nearly all of the internal systems employees use to communicate and work.

Several employees told The Verge they’ve resorted to talking through their work-provided Outlook email accounts since Facebook mainly runs on an internal version of the social network that is currently not accessible. While employees can email each other, they can’t send or receive emails from external addresses.

Since Facebook requires employees to log in with their work accounts to access tools such as Google Docs and Zoom, those services also aren’t working, leading some employees to use alternative services like Apple’s FaceTime and Discord. Employees who were already authenticated with non-Facebook tools like Google Docs before the outage began still have access.

Further complicating matters, the outage has broken the ability for some employees to access company buildings and conference rooms with their badges, according to The New York Times, which first reported that engineers were being dispatched to the data center.

A Facebook spokesperson pointed to a tweet by Schroepfer saying the company was experiencing “networking issues” and that employees “are working as fast as possible to debug and restore” its systems.