Users worldwide were affected by the outage, The Associated Press reported, many of whom took to Twitter to express their outrage (mock and in some cases genuine) and crack jokes.
After about 40 minutes, Facebook and the rest of the sites were back online.
— Creative Chaos (@csquareonline) January 27, 2015
Lizard Squad, the hacking collective that claimed responsibility for taking down the Malaysian Airlines website on Sunday, suggested on Twitter that it was also responsible for the social media outage.
However, in a statement cited by TechCrunch, Facebook denied being hacked:
"Earlier this evening many people had trouble accessing Facebook and Instagram. This was not the result of a third party attack but instead occurred after we introduced a change that affected our configuration systems. We moved quickly to fix the problem, and both services are back to 100% for everyone."