If you know for sure that your SSN is not listed on your comp then it's not your SSN it's talking about: it can't have guessed it. And yes, yes, I know that the net is a dangerous place where you can get anything, but that don't make it a mind reader.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-