It depends. If the postcard has a picture of your city, you may want to write something about the city. You can also talk about yourself, talk about something funny, or just say hi! It is really up to you to decide what you would like to write; there are no constraints but please be conscious that you may be writing to a child. If you are stuck, here are some ideas about what to write:

• your place of residence
• yourself
• your personal homepage or weblog
• your country
• questions about the person or place or country you are writing to
• information about how the other member can contact you

Always remember to clearly write the Postcard ID that is provided to you. The Postcard ID is the only way the receiver can register your postcard on the website.