Empty is a app allows you to surpise/amaze/irritate your friends by sending an empty or blank message. You can not send a blank message in Facebook or WhatsApp directly but with this app you can do this with just a single click. Simply click on the send button and select your friends to whom you want to share an empty message.
And the second best thing is that this app is available in 7 languages. So just download it and enjoy.