The PlayStation Network is down and Sony knows it. Luckily(?)this has happened after the holidays so not as many people will be affected by the outage this time, like last year with Lizard Squad knocking the network offline.
PSN has been down for hours now and Sony is not willing to offer an explanation and is telling us to continually check back at this page here.
While some users are reporting being able to access the service, the majority are unable to do anything.