WhatsApp, Instagram and Facebook have gone down in several parts of the world, users reported on Monday evening.
All three apps are owned by Facebook and run on shared infrastructure.
“Sorry, something went wrong. We’re working on it and we’ll get it fixed as soon as we can,” a message on the Facebook website said.
The message suggested a Domain Name System (DNS) error. DNS allows web addresses to take users to their destinations. A similar outage at cloud company Akamai Technologies Inc took down multiple websites in July.
WhatsApp acknowledged the outage on Twitter. Facebook issued the same statement through a spokesperson.
The website downdetector.com, which tracks web services, also showed there were more than 50,000 incidents of people reporting issues with Facebook and Instagram. The outage might be affecting a larger number of users.
Facebook has experienced similar widespread outages with its suite of apps this year in March and July.
The outage comes a day after a whistleblower went on US television to reveal her identity after she leaked a trove of documents to authorities alleging the social media giant knew its products were fuelling hate and harming children’s mental health.