Is PlayStation Network down and when will it be back up?

Players have taken to Twitter after experiencing problems logging into their PlayStation Network accounts this morning. Sony did announce plans for the console to undergo maintenance between Monday and today

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Do these Sony offerings make up for the PlayStation Network outage?

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Playstation Network (PSN) down? Current status and problems

PSN Down Across All Platforms, Every Service Affected

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Are the Sony PlayStation Servers Down?