Millions of users across the world were left shocked and confused when they were unable to access Facebook for the second time in less than a week.

The social media website crashed at about 5am Tuesday (AEST) when a message appeared on the screen that said: “Sorry, something went wrong. We’re working on it and we’ll get it fixed as soon as we can.”

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The social media site was eventually up and running again within one hour.

Facebook told American news channel CNBC that the outage was due to a “configuration issue”.

The site suffered a similar outage on September 24, when it crashed in North America, Europe, Australia and India.

The disruption caused a wave of concern, with users turning to Twitter to vent by using the hashtag #FacebookDown.

Hello, IT department? #facebookdown pic.twitter.com/IDavTewVmo

— Ann-Marie (Ammy) (@muir90_m) September 28, 2015

RT @BarDown People refreshing their FB page every 5 seconds to see if it’s back up #facebookdown pic.twitter.com/WfmtEQbMUT — Juha Takkinen (@TheFunFinn) September 28, 2015

#ISurvived the #FacebookDown pic.twitter.com/sb6i9hRwcA

— Wade (@RealTallWolf) September 28, 2015

#facebookdown” qm qr ser minha capa” Bôóa Nôôitê Facê ” N PF SENHOR N TRAGA ELES PRA CÁ pic.twitter.com/e6L0pK1dao — Nathy ∽ (@Mina_Do_George) September 28, 2015

How will I know who’s Birthday it is? Or who will invite me to play FarmVille? #FacebookDown

— Comedy Photos (@RealPhotoBombs) September 28, 2015