Don't panic. Don't check your computers. Don't call the authorities.
Those pictures of your kids eating ice cream funny will have to wait.
Facebook is down for many users, as of Monday evening.
No explanation is available at this time.
Many have taken to Twitter to report the outage. Others joke about using MySpace again and that the Mayan apocalypse has come early.
Stay tuned for more.
What do you do when Facebook's down? Upload a picture to this story and show us!