In a brief moment of darkness, Facebook's Messenger app was down on Tuesday morning.
After attempting to send a message, an error message appeared saying "Sending failed. The operation couldn't be completed."
The outage was fixed within about 20 minutes, but not before scores of people took to Twitter in panic.
It isn't the first time Facebook has been down recently, with another worldwide outage affecting the whole site on Sunday.
While only the Messenger app appeared to falter on Tuesday, Sunday's outage affected most aspects of the site, with newsfeeds freezing, and parts of the app glitching.
Global map, which tracks outages across the world, indicated that Sunday's outage was worst in the United States and in India.
The app is used by more than 1 billion people worldwide.
Instagram, which is owned by Facebook, appeared to be unaffected by Tuesday's outage.
Newshub.
