When tagging a person, send him/her a card, written in their language.
If you speak it, great!
But if not, it might be very, very fun.
You are supposed to find an online translator, dictionary, phrase list, whatever helps you and use it to write a couple of sentences on the card.
“Tag” the last person in this topic, ask for their address by private message, send a postcard to this address, write “Send Me a Postcard Written in My Language Tag”, your username and a text in the receiver’s language – and then wait for someone else to tag you and send a postcard to you written in your language. Don’t forget to tell us which is your native language.