Social media applications WhatsApp, Facebook, and Instagram are down for tens of thousands of users.
The issue affecting the services could not be immediately confirmed.
However, the error message on Facebook’s webpage 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.
“’we are aware that some people are having trouble accessing our apps and products,” the social media giant’s official Twitter handle said on Monday.
“W’re working to get things back to normal as quickly as possible, and we apologise for any inconvenience.”
The official handles of WhatsApp and Instagram also took to Twitter to confirm the outage.
Facebook shares fell 5.5 percent in afternoon trading on Monday, inching towards its worst day in nearly a year.