Hacker group Lizard Squad have claimed to be behind the outage at Facebook and Instagram.
They have previously claimed responsibility for cyber attacks on the Playstation Network and Xbox Live services and most recently theMalaysia Airlines website.
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.