Instagram's direct messaging features have gotten surprisingly robust over the years. You can send photos privately to another user (or group of users) and share other images you see from Instagram users with just a few taps. (The latter feature is particularly good for sharing dog pictures, just saying.) Instagram also added "disappearing" photos and videos to the mix this past November, one of the most obvious instances of Facebook and Instagram "borrowing" from Snapchat. Today, Instagram says they're combining disappearing and permanent messages all into one thread -- an obvious UI update that seems like it should have been there from the beginning.