Postcrossing
Katie 
If you follow my public twitter (@KatieSociety) you might have seen tweets such as:
Writing a #postcrossing postcard to Germany through http://www.postcrossing.com
I’m not sure how I first stumbled upon the site, but I have been collecting postcards since I was a kid (lately they get stuck in scrapbooks) and on top of that – I love travel and getting mail. And if I can’t visit around the world, why not do the next best thing and send and receive postcards from all over?
You are allowed to have up to 5 postcards traveling at a time. Right now I have cards on their way to Germany, Netherlands, Lithuania, Maine and California.
I have received cards from Italy, Ohio and California.
The concept is simple – you send a card to a random person and you receive a random card back. The more you end up sending, the more you can have traveling at a time. Shown is my first card I received from Italy. I loved the way this person wrote! (I have an odd fascination with how people make “K”s so don’t be surprised if I end up having a collage of my name from postcards in the future)
I’ve been warned this new hobby can get expensive. The postcards I’ve found at Hallmark cost me $0.35. To send a postcard Internationally I’ve found it is $0.98, within the states it is $0.28. But so far I am having a lot of fun with it – and I can put my account on hold at any time!