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MOO makes neat postcards. You can print them with your own photos or choose from a great selection. Plus, they ship globally!
Have a look!
Well, no. The main idea is postcards, so you have to send at least that. If you are more into letters or just find a postcard too short, send a letter too. If you are into Bookcrossing, you can also send a book if you want to. What you send with the postcard is up to you. No constraints are made about that, but try to use common sense on that one.
