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its not because of a store update, since when do they turn off the playstation network.
Lets hope it some kind of maintenance, ready for a update to sort all this shit out.
anyways to check if its online again click the following link:
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look up in the top right hand corner it will say PSN: Online/Offline at the moment its Offline.
most of us had trouble signing in when it was Online, so for them to turn it off something must be going on, reminds me of years ago when ps3 came out they'd shut PSN off do some maintenance while the US sleep and EU have morning, then it'll be back on with either a update or a update in the following days.
so the best bet is not to keep trying to sign in as im sure that wont work, do something else and check that site every hour.