After a day or two Japan government told Sony to take down their PSN and assure them that it is safe for users to use. Sony might didn’t listened to the Japan Government and again went into the PSN Breach. The exploit allows people to change users’ password via the PSN password reset page using only a PSN account email and date of birth – both of which were obtained by hackers in the original breach.
“Unfortunately this also means that those who are still trying to change their password via Playstation.com or Qriocity.com will be unable to do so for the time being,” a Sony statement confirmed.
The main problem is the hackers got the all the details of the PSN User who signed up before the Hack. The person who knows all the details, including your Date of Birth, Email ID, also know about your other stuff also.
Well people who got their PSN ID working can still go online and view the trophies and friends. But it is safe that now to go online until further confirmation.