Here's the latest update to WhatsApp instant messenger, a disappearing message.
WhatsApp is working on a new feature that should be available to all users when completed. This is called the disappearing message feature.
Disappearing Messages
Any messages you set to disappear after a while will be automatically deleted from the chat! A message is eligible to be disappeared when the chat is marked as “disappeared”. All messages will be automatically removed after a certain interval, if marked as disappeared.