WindUp is a SnapChat clone from Microsoft and is now available for Windows Phone 8 and 8.1 devices. The description:
Create and share fun, temporary messages and media with friends using WindUp. Decide how long a message will last – set it to expire after a time or view limit of your choice. Set a low limit to “wind up” your friends as they race to see what you’ve posted, or set the limit high to make your message last longer. WindUp lets you share pictures, videos and audio snippets, as well as text.