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I want to change the postcard with all over the world friends.
I guess you want to exchange your postcards with people all over the world .
Have you tried Post Crossing? www.postcrossing.com
You register (free) and get the name and address of someone else in the world who wants to exchange postcards. In the beginning you are limited to the number of cards you can send. Later you can send more and more. It's great fun to get home from work and find a postcard for somewhere in the world with a few friendly lines from another postcard lover.
I think it's a very nice idea Mars. I used to collect postcards.