WhatsApp, Instagram and Facebook are now back online after being down for more than six hours in a major outage.
The three apps – which are all owned by Facebook, and run on shared infrastructure – stopped working shortly before 5pm UK time on Monday.
Other related products, such as Facebook Messenger and Workplace, also stopped working.
Facebook has now explained in a detailed blog post what caused the outage - and why it took so long to fix.
It comes as former Facebook product manager and data scientist Frances Haugen testifies before a Senate subcommittee about the company’s research into Instagram’s effect on the mental health of young users.
In June and April this year, the social media giant’s platforms unexpectedly went down due to a “network configuration issue”.
Read our live coverage of the outage below
