nope should be back tomorrow (may 4th)
They said they would start bringing the network up this week and the best information available will come from the related Sony Link
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Supposed to have some services back up I.e. psn on may 3rd but we will see see related link or question
you can't yet but some day they might put it on the PSN
You can't yet. The demo is available on PSN and Xbox Live, but not yet on PC. Search the internet for exact date of realse of the demo.
No, PSN cards can be used only once. If are from a different region and you need a PSN card that belongs to a different region since you have a different region account then you can buy the PSN card from online
the time psn will be back on is not known and not predictable, the network needs critical security repairs Sony indicated services are ready to begin coming on by regional area the 1st week of May 2011