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Unless you wrote it down on something when you gave them your info then there is no way to find out who has your account active.

Yes there is You must login or register to view this content.

I wish it would tell you which system was which tho... I have a 60GB I need deactivated... I would hate to deactivate the wrong one ...

All that site shows is how many PS3s and PSPs that you have activated on your account but it does not let you deactivate them from that site......

As of this moment, the only way to deactivate your accounts from a console is through the "Accounts Management" tab in the XMB of that specific console or by calling Sony's Customer Support.

If you don't believe me then go ahead and try clicking on the "deactivate" button and see if it deactivates it for you.