Postcard Etiquette. Is there such a thing?

I have always had a love of post cards. Whenever I travel, or have friends that travel, I either pick some up or have some sent to me. This was why when I found the website Postcrossing I was ecstatic!
If you have never heard of Postcrossing it is a site that gives you addresses of people around the world who would like postcards and gives out your address to people from other countries in exchange.
Its great!
Just today I was given addresses of people in China, Finland, the UK, Russia and Brazil. So I fill out my postcards and head to the post office for postage.
When I walked into the lobby, I found, for the first time I believe in my entire 28 years, not only was there no line, but I was the only customer there.
Instant service ensued and soon I was putting 98 cent stamps on my post cards. Since there was no one there I stayed at the counter to put the remaining stamps on and the clerk said she would help me out by putting the "Airmail" stamp on them. As I finish with my portion I look over at her and what is she doing? She is reading what I wrote on the card..
Now, these are very impersonal cards.
Typically all I end up saying is "Hello! My name is Rebecca and I am from the city of Portland, OR. This card shows.... [whatever local feature I decided to share with this person]... blah blah blah... Hope you have a great day!" but that is beside the point!
What makes people think that just because it is not in a sealed envelope they have a right to see what it says?
What if it was in an envelope with the flap open? Would they take it out and read it? I think not. In fact, reading other people's mail is against the law in some states. Sure, there is an expectation of privacy with letters, but if the card is not addressed to you do you really have a right to read it?
I think it would be interesting to send a card somewhere with a tally section stating "if you have read this mark here" to see how many people actually read a card from point A to point B..
I have a feeling that the results will astound me.
Would anyone like to be my point B?
Email me :)

Love Postcards? Try PostCrossing!

Anyone that knows me knows I have a love of post cards. Whenever I go anywhere (outside of my own state of course) I make sure to pick up a few postcards that capture the area that I had been exploring. Whenever a friend goes on a vacation to somewhere new I always ask for them to bring me back some post cards which is most often well received because out of all the things that I could ask for, post cards have got to be the least expensive (and yes, it even beats shells from the beach because honestly, sometimes you just cannot find any good ones and who wants to spend their whole vacation scouring the beaches for a good shell?).
I was proclaiming my love of post cards on Twitter a couple of weeks ago when one of my friends told me about a little site called PostCrossing. This is a place where you can go and sign up to get postcards from around the world sent to you. The only catch is that you have to send some first! That's right, completely free (aside from the $0.90 international post card postage rate), very interesting and after finally sending out the five cards that I agreed to send out (the snow storm has kept me from going to the post office for over a week now) I can wait and see what shows up in my mail box :)

So far I have sent cards describing the Pacific Northwest to Finland, Tawain, Germany, and Estonia (if you are doing the math I actually got two different people from Finland). Anyone want a postcard? Let me know!