A Facebook logo is seen through the windows of the NASDAQ stock exchange as people walk by on Times Square in New York, May 17, 2012. Facebook is set to go public on May 18, 2012 and is likely to have an estimated market valuation of over 100 billion USD when its shares begin trading on the NASDAQ. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/GettyImages)