Mark Zuckerberg-led Facebook says a faulty configuration change led to the global outage which left millions disconnected from the messaging and social platforms.
All three services are owned by Facebook and could not be accessed either via PC or mobile.
The services went down at about 16:00 GMT with users beginning to gain access to the sites at around 22:00.
Facebook said that the faulty configuration change affected the company’s internal tools and systems adding that there was ‘no evidence that user data was compromised’ as it lasted for a long time, close to six hours.
Earlier, Facebook founder Mark Zuckerberg apologised to those affected by the outage, saying Facebook was making sure people were able to reconnect with the people they most care about.