On March 13, Facebook was down for eight hours, one of the longest down in Facebook history, which also effected Facebook-owned Instagram, Whatsapp, and Messenger.

Facebook responded to the rumors that it was hacked on March 13 as the social media giant grappled with a website outage affecting millions of people across the world.

“We’re aware that some people are currently having trouble accessing the Facebook family of apps,” it tweeted.

“We’re working to resolve the issue as soon as possible,” said the firm.

It later added: “We’re focused on working to resolve the issue as soon as possible, but can confirm that the issue is not related to a DDoS attack.”

However, Facebook didn’t elaborate on why its websites or apps were down.

According to Downdetector.com and related websites, Facebook appeared to be down for many. In the comments section, people across the United States said the site was down for them.

“I’ve never seen it down this long. Unreal,” wrote one user.

A number of people went on Twitter, which isn’t owned by Facebook, to express their frustration.

Hashtags #FacebookDown and #InstagramDown were the top spots in Twitter’s trending section for most of the day.

Other details aren’t clear.