Facebook is back for some users after more than six hours offline.
The website and app first experienced issues early on Thursday morning, dragging WhatsApp and Instagram down with it.
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While users are now reporting they are able to access Facebook's apps and websites, some say their ability to comment on posts or add new content is limited.
Instagram has been returned to full functionality while on Whatsapp, users are still limited to sending text messages only.
All three services are owned by the same company.
Facebook acknowledged the issues on Twitter, but did not give any indication into what had caused it aside from to say it was not the result of a distributed denial of service attack.
"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.
"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."