There is an interesting article on Morningstar about social security funding:
One part I found very interesting was the part about how the system came to be funded the way it is, with special treasury securities. It seems the democrats wanted to have SS funds invested in he private sector but the republicans objected because they considered such government investments in the private sector as a form of socialism. Now it seems we have come full circle where the republicans want the money invested privately while the democrats want it to stay the way it is. So both parties have completely flip flopped!
It's a bit of a "don't worry, be happy" article and I question some of the conclusions, though not the facts, but it is worth reading anyway if you have concerns about the solvency of the social security system.