Random card

Postcrossing

Communicate with a random participant only through ordinary postcards.
You send a card to someone unknown and can get it from someone.

It's clear that we send a card to no one at all, it is necessary for the addressee to want it. Therefore, you register and get an address to which you can send a postcard. Also, your address falls into the database, wait for the postcard.

The site also has a blog and a forum for communication. After all, the main idea is communication.