It's not just paranoia................

[Griffin NoName]

I just found my PayPal account has all the addresses that I have in my Amazon account. I am completely spooked.

[ivor]

It's okay.  I put them in there for you...

[Sibling Zono (anon1mat0)]

Your HSBC account is safe (your RBS one OTOH...) 

[Griffin NoName]

  dammit this is serious 

[Sibling Zono (anon1mat0)]

PayPal is a subsidiary of eBay and it isn't a valid form of payment in Amazon, so that seems odd, the obvious question is if you don't recall entering the info in PayPal.

[ivor]

Why don't you call them and ask? 

[Griffin NoName]

I'm too scared to phone them.

The only address i've entered in PayPal is mine.

It's possible they log the delivery address entered on a site when a site gives the option of paying by PayPal, but the addresses ares ones I've only ever used Amazon for.

[Sibling Zono (anon1mat0)]

The possible things are foreign cookie reading (low level) or a common corporate partner sharing information (high level).

In both cases they may be trying to subvert your privacy in the name of convenience, and not in a necessarily nefarious* way.

*There is no reason for the NSA or GCHQ to redflag this communication.