Snapchat which is an app that lets you send a time limited picture deletes it when you view it. You can't view the message without their client. Of course you

Snapchat which is an app that lets you send a time limited picture deletes it when you view it. You can't view the message without their client. Of course you can take a screenshot of the image, but they have figured out how to capture that event and it alerts the sender.