Thousands of users say they continue to have issues accessing Facebook, WhatsApp and Instagram.
Yesterday afternoon, the major social media platforms stopped working for millions across the globe.
It's understood the outage lasted around seven hours in total.
However, the Mirror reports that on Tuesday morning, a number of users are continuing to experience issues, according to Down Detector.
On Monday, the widespread disruption was blamed on a "faulty configuration change", with Facebook saying in a statement: "Our engineering teams have learned that configuration changes on the backbone routers that coordinate network traffic between our data centres caused issues that interrupted this communication.
"This disruption to network traffic had a cascading effect on the way our data centres communicate, bringing our services to a halt."
Desperate social media users took to Twitter to vent their frustration at being cut off from their social world for so long.
Facebook's share price plummeted 4.9% amid the outage, with estimates that owner Mark Zuckerberg lost $7 billion since the problems began yesterday.
Outage tracking site NetBlocks estimated the online issues already cost the global economy some $160 million.
Facebook has been contacted for comment.
