Stone Print Puzzle

Who actually built the Georgia Guidestones and how did the number 500,000,000 get picked?
what are the other languages that are printed on the stones? where is the map that shows where the "safe" places will be? is this another puzzle about 2012?
no one knows the actual person(s) who commissioned it.
In June 1979, an unknown person or persons under the pseudonym R.C. Christian hired Elberton Granite Finishing Company to build the structure.
...these languages are: English, Spanish, Swahili, Hindi, Hebrew, Arabic, Chinese, and Russian.
...In the end, Smith concludes that Ted Turner is the most likely candidate for being R.C. Christian
---------
dont know the answers to the rest (: