What is Postcrossing?
Postcrossing is an online project that allows its members to send and receive real postcards from all over the world. The project's tag line is "send a postcard and receive a postcard back from a random person somewhere in the world!”. Its members, also known as Postcrossers, send postcards to other members and receive postcards back from other random Postcrossers. Where the postcards come from is always a surprise.
Postcrossing is the union of the words "postcard" and "crossing" and its origin "is loosely-based on the Bookcrossing site". However, the "crossing" or exchange of postcards works in a different way. A member sends a postcard to another Postcrosser and receives a postcard back from a random Postcrosser. Exchanges between the same two members only occur once; although direct swaps between members happen, they are not part of the official happenings on the site. The project is completely free and anyone with an address can create an account. However, the postcards themselves and postage fees to mail them are the responsibility of each user.
As of the end of December 2012, Postcrossing had over 365,000 members in 215 different countries who had exchanged over 15 million postcards that have traveled over 78.8 billion kilometers.