I got Birthday wishes from friends we met on our first cruise. We have also met up with them in Vegas a while ago. The sisters we met on the Bermuda Cruise, still e-mail us and we chat on Skype. On our first cruise our bartender kept our e-mail address and now we get updated pictures of her kids, and Yes, a Christmas card.
like any people we meet during our lifetimes, communication is the keys and acceptance of every persons "quirks" is a must.
We have a lot of fun with the people we have met. I hope to meet many more.