WhatsApp, Instagram and Facebook Messenger are all down.
Down Detector shows reports of all three services being down starting from around 5pm today (19 March).
According to reports, some users have reported receiving error messages. For example, Android users on Instagram have seen '5xx Server Error' appear on their apps.
Some have also seen the message: "We're sorry, but something went wrong. Please try again."
WhatsApp users, however, have noticed that their messages are failing to send, with the little clock symbol left hanging.
While more than 5,000 Facebook users reported issues with the site at 5.32pm.
As of yet, it's unclear what the problem is with the apps, all three of which are owned by Facebook.
The outage was short-lived, though, with users now reporting that the sites have returned.
Sharing their joy, one person asked: "How many of you are feeling like alive after whatsapp facebook instagram are back?"
Another said: "Facebook messenger is back."
This comes almost a week after a glitch on Twitter caused users to have their tweets removed and accounts blocked for sharing the word 'Memphis'.
At the time, dozens reported having their posts almost immediately removed and their accounts blocked for sharing the word.
And those who did dare to tweet the name have received a message informing them they had been locked out for 12 hours.
Even Dutch midfielder Memphis Depay's club Olympique Lyonnais commented on the bizarre series of bannings.
Hey, @Twitter - can we talk about him yet? :smile: pic.twitter.com/nVn3nY9zBb
- Olympique Lyonnais :flag_gb::flag_us: (@OL_English) March 14, 2021
Sharing a snap of the player, the club's US account asked: "Hey, @Twitter - can we talk about him yet?"
Under the tweet, a number of users were seen egging each other on to write his name, asking each other what is Depay's first name or what is that city in the US called?
And it didn't go down well for those who have, with countless posts being removed.
Where Memphis' name had been, it read: "This tweet violated the Twitter rules."
In a bid to get around it, some took to adding accents onto certain letters in the word or writing it out in capitals. For example, 'Memphìs' and 'Memphis'.
Twitter later confirmed that it was the work of a bug, which has now been fixed.
In a statement to Gizmodo, the social media giant said: "The issue referenced was a result of a bug, and has since been resolved."