From the York, Nebraska News-Times:
Q: How much has Social Security paid out since it started?
A: From 1937 (when the first payments were made) through 2009, the Social Security program has expended $11.3 trillion.
Q: How much has Social Security taken in taxes and other income since it started?
A: From 1937 (when taxes were first collected) through 2009, the Social Security program has received $13.8 trillion in income.