alt Hacker News100s of millions have definitely been exposed already. The best defence is probably to be a baby so your risk window is minimal. I haven't been able to pull that off personally, so I follow the other recommended piece of advice which is to keep your credit checks permanently frozen with the agencies and only temporarily thaw it for specific usages.
https://www.upguard.com/breaches/social-insecurity-billions-...
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throwaway173738 • yesterday at 1:13 PM
They’ll definitely issue loans to a child. You have to actually put a special freeze on your child’s credit account, which is insane but welcome to the US, where any obstruction to the wheels of commerce is an affront to our national dignity.
Which is a shame, as there are only hundreds of millions possible… and they still have to include room in that 9-digit namespace for non-social-security-involved ITINs and employer ID numbers!