Pins are like its own currency. My first exchange experience happened at the Media Village with a man who works for a TOP sponsor, Coca-Cola!
He saw my GWU pin on my lanyard, and was curious to know more about it. I explained to him that I was a student at GW and that a group of us were here to help the IOC with data collection. So, I traded my GWU pin for one of his, it has the American Flag, Olympic Rings, and Coca-Cola name.
It was definitely an outstanding experience, and I hope to gain more awesome pins along the way!