They shut down at 5pm yesterday.
Facebook, Instagram and WhatsApp have all returned after a major outage on Monday.
Facebook and affiliated applications such as WhatsApp and Instagram had all been down as the outage impacted multiple countries including Ireland, the UK and the US.
The apps stopped being accessible for users at roughly 5pm.
Facebook apologised to users on Monday night, penning: "To the huge community of people and businesses around the world who depend on us: we're sorry.
"We’ve been working hard to restore access to our apps and services and are happy to report they are coming back online now."
https://twitter.com/Facebook/status/1445061804636479493
"Thank you for bearing with us. We’re now back and running at 100%," WhatsApp added on Twitter.
"Thank you to everyone around the world today for your patience while our teams worked diligently to restore WhatsApp.
"We truly appreciate you and continue to be humbled by how much people and organizations rely on our app every day."
https://twitter.com/WhatsApp/status/1445214728410710019
Instagram said on Monday night that they are "slowly but surely coming back now".
"Thanks for dealing with us and sorry for the wait," a statement on Twitter continued.
Facebook told Reuters on Monday that the cause of the global outage that took its services and internal communications tools offline for several hours was due to a "faulty configuration change" to its routers.
