Those who like to investigate, investigate this:

The Social Security trust fund does not hold any real economic assets that can be drawn down to pay future benefits.  That is an indisputable fact today, and it has been true ever since the 1983 payroll tax hike was enacted.  Every dollar of the $2.5 trillion in surplus revenue, generated by the payroll tax hike, has been spent on programs unrelated to Social Security, leaving nothing to save or invest.