Only the authorities, by requesting information from Sony. Never a random member of the public.
Do you mean why is the PlayStation network down
The network is down more information is available at related question
one month and a half
Most of it is up but the PlayStation store was still down on May 30 2011
No it has been up for months
The network will be down for days and the related question will be updated with the latest information
No the PlayStation Network was shut down and the related question has more information
Network was shut down April 20 2011 and is completely back up with PlayStation Store opening June 2 2011
Yes the worldwide PlayStation Network has been shut down while they rebuild it after an attack. The related question will be updated if new information is available
PlayStation network is down for maintenance today (21/09/2010) until 5pm Pacific Time
The network is down more information is available at related question
They shut the network down after learning that it was hacked. The hacker did not crash the network and only looked at and maybe downloaded information