The outage appears to be affecting users across the U.S. and Mexico, as people logging on to the site Monday afternoon were met with error messages.
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Some Facebook users reported errors with the network's Messenger app.
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Users of Instagram and Whatsapp, both of which are owned by the social network, are also reporting trouble accessing the photo sharing and messaging services, respectively.
Facebook has not issued a statement on the issues, which began late Monday afternoon.