Did you try to log onto facebook and get an error
facebook down for maintenance [onlinegeeks.net] message?
It's very uncommon for Facebook to suffer from such a long outage with facebook now having been offline for over 2 hours. If facebook is down with a message about some sort of maintenance, then wait it out is all you can do. Sometomes it's issue impect every facebook user, but sometimes it's just a small portion.
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https://onlinegeeks.hpage.com/what-caused-facebook-to-go-down.html [onlinegeeks.hpage.com]