Postfun is a social networking application that allows users to exchange real paper postcards with people from around the world. Developed by Ilya Ostashkov, this free app is available on the iPhone platform.

With Postfun, users can request a postal address and a unique Postcard ID within the app. They can then prepare a real paper postcard, fill it out, write the Postcard ID on it, and send it to the requested address. After a few days, users will receive a postcard from another random Postfun user.

The process doesn't end there. Upon receiving a postcard, users are encouraged to register the Postcard ID they have received and thank the sender. This creates a continuous cycle of exchanging postcards and building connections around the world.

Postfun aims to bring together millions of people who share a passion for collecting postcards. Whether it's collecting postcards on a particular topic or simply enjoying the variety of stamps from different countries, Postfun offers a platform for users to engage in this exciting hobby. The Postfun team strives to make the postcard exchange experience as pleasant as possible for every user.