Sometimes, we are happy to share, but only for a limited time, and then want that image to be vanished ( a wonderful memory) it is very easy to do this in chats, here's a quick guide...
-In your chat, click on blue + button, next to the Type your message box
-Select Camera Roll, and choose the photo or video you would like to share
-In the Type your message box, press the blue clock with off written on it.
-This will give you timing options for your photo to expire.
-Choose your expiration time, and press the arrow for send.
Your photo will post and expire within your chosen time.