Facebook is having a major outage.

The Silicon Valley social network, as well as its photo app Instagram and messaging platform Messenger, went down for some users across the globe on Wednesday for several hours.

Some users reported they were able to open the social network (albeit slowly) but couldn’t post anything, while for others it wouldn’t load at all.

DownDetector, a website where people can report outages of popular internet services, indicates there has been huge spikes in complaints about Facebook, Messenger, and Instagram over the last several hours.

It isn't immediately clear what's causing the issues.

In a series of tweets, Facebook confirmed the outage, and said it wasn't being targeted in a DDoS attack, as some people had speculated without evidence. "We're aware that some people are currently having trouble accessing the Facebook family of apps. We're working to resolve the issue as soon as possible," its official account wrote.

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."

As of around 4.30 p.m. ET (1.30 p.m. PT), Facebook seemed to be working for some users, though others remained unable to post.

A spokesperson did not respond to Business Insider's request for comment.

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