According to reports, some users are getting a message that says "Facebook will be back soon".
That these services have been struggling for hours indicates that, whatever the issue is, it's not something Facebook's massive engineering team has been able to easily fix.
Instagram users have reported being unable to refresh the feed, log in, or access the desktop site.
Facebook did not give an estimate for when they expect the problem to be resolved.
The social networks went down with issues across Facebook, Facebook Messenger and Instagram.
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UPDATE: Facebook said in a Twitter post that the downtime isn't caused by a distributed denial of service attack after some rumors to the contrary.
It's not just your Facebook page that's down. It also noted that "the issue is not related to a DDoS attack".
Many people took to Twitter as their only alternative, with some making fun of the inevitable migration. Users have written in from Canada, Las Vegas, and Turkey to note outages there as well.
Poking fun at the popularity of cat content on social media, one user shared their concern for all the cats unable to upload videos.
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Technically, Facebook is not down - the site can still be seen and accessed.