No, don't give your SSN. Either just use the account number (partial as it looks on your CR) or get a CR directly from one of the CRAs...those usually show the whole account numbers. Third party pulls are formatted different and most of the time don't have the full account numbers and such.
With most of my DVs, I just put (example) 12345xxxx (this is all that shows on my credit report)...they all were able to respond to me and found the account.
ETA: If, by chance, they do come back and say they need more info to find your account, just give them the last 4 of your SSN..not the whole thing
Starting Score: EQ = 550; TU = 491(2/10/12)
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