Instagram is completely down, leaving people unable to use either its app or website.

Visitors to the website see a message reading "5xx server error" and nothing else. App users will see a message saying that the app "couldn't refresh feed" – though the problem looks temporary, it isn't actually possible to get new pictures at all.

It isn't clear what the source of the problem is or if it will be fixed any time soon.

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The outage follows a huge outage last week that took down many apps and websites including Twitter and Netflix. But it doesn't seem to be connected to those problems or springing from the same cause – no other services appear to have been hit by Instagram's outage, including its parent Facebook.