when u sign up for psn what does sony do with your address? does it show up on official playstation forums? do they send u things? did u put ur real one?

I don't think they do much with it. I have a US address which I just made up, it might have to be the same as your credit card address, but I am not sure about that

It doesn't. I'm in europe and i've also used my card on my hong kong psn.. for a few ps1 classics :p

they wont do anything with it.

the only addy they will use for themselfs is the original registration.

all the false ones dont count.

Well, they used the address to send me a free copy of Casino Royale on Blu-ray, but that promotion doesn't exist any more.

I'm not sure what they use it for, but don't worry, it's not displayed anywhere. Maybe if you win a prize or something, they know where to send it.