A dollar bill tracker is a website like WheresGeorge.com that allows people to track a dollar bill as it travels to other destinations. In order to track a bill, a person must register with the tracker site and enter information about the bill into a database.
According to NPR, dollar bill tracking is a hobby that has grown in popularity. People who engage in bill tracking call the hobby Georging and call an individual that engages in bill tracking a Georger. Tracking is done via bill serial numbers and zip codes. Georgers receive email notifications when a bill they are tracking is entered into the database by a person that has registered the same bill.