Deltiology is the term for studying and collecting postcards. Currently, deltiology is the third largest hobby in the world next to coin and stamp collecting. It was a huge craze in the 20th century, particularly from 1907 to 1913. In fact, the US Post office recorded 667,777,798 postcards mailed in June 30, 1908.
However, with advancement in technology, postcards have been ignored more and more. They are uncommon these days and difficult to find in stores.
The latest craze in postcard these days is Postcrossing. It’s an online project where members can send and receive real postcards anywhere in the world. As of 2010, there are already 200,000 members from 200 countries.
Here are some of the oldest postcards created: