Where's George? is a website that tracks the natural geographic circulation of American paper money. Its popularity has led to the establishment of a number of other currency tracking websites (of which Where's George? remains the most popular by far), sites that track other objects—such as used books—and it has been used in at least one research paper to provide statistical patterns of human travel in the United States.
As of October 13th, Where's George? is tracking 214,246,554 bills totaling US$1,154,872,421. These numbers are constantly changing as users add the bills they are tracking.
Read more about Where's George?: Overview, Hits, Controversy, Where's George? and Geocaching, George Score, Community, Use in Research