Facebook had a major website failure on Monday night.

Users in Asia, the U.S., the U.K. and Australia reported that the popular social media site was inaccessible for more than an hour at 11 p.m. EST, according to the Boston Globe. Facebook's Instagram site was also affected.

If the website failed on such a level, then one has reason to suspect that outside parties may have been involved.

"This was not the result of a third-party attack but instead occurred after we introduced a change that affected our configuration systems," Facebook clarified in a statement.

The Facebook outage apparently lasted for an hour and was one of the longest "major outages" since September 24, 2010, which lasted over 2.5 hours.

The outage was notable enough that people suddenly started tweeting out the hashtag #facebookdown, which trended for a time.

Current reports suspect that the Facebook outage affected up to 1.3 billion users and close to 300 million Instagram users.

Facebook took responsibility for the internal problem so that hacker groups, such as Lizard Squad, could not claim to have caused it. 

The outage occurred directly after the Lizard Squad claimed to hack the Malaysian Airlines website. The notorious team of hackers has claimed to be behind many website and system hacks in the last year, including Playstation Network's, League of Legends' and Machinima's DDoS.