No, I didn't. Because it is. Social Security would be illegal if it was run by a private company.
And just like pyramid/Ponzi schemes, it will collapse when it runs out of people to "join at the bottom".
Even though wage earners are forced to join, demographic trends (fertility rate and life expectancy) are shrinking the ratio of contributors to beneficiaries. At some point, it could shrink to 1 contributor for every beneficiary.