I am certainly in agreement that no SS # should be posted on any public document.  Sadly, with identity theft being a real threat in today's environment, we all have to be careful to protect our private information and SS #.  If SS # were not allowed to be on public documents that would help the citizen to protect himself/herself.  If there is so legitimate need to have the SS #, I would suggest only using the last 4 digits which would offer some protection.  Thank you for your consideration of my comments.