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Do it's best to guarantee that a post will be removed.

In a world where everything you do is recorded and stored long term the promise of something fleeting is a beautiful promise.

Doodling on the photos is surprisingly useful. To do that via mms you would open the camera app, take the picture. Open the drawing app, draw it save it. Open the texting app, load the picture and send. Snapchat is snap, doodle send.

Not send a picture already taken. There's a sense of immediacy on the sender side (and urgency on the viewer side, before it goes poof) that reinforces the nowness. If you're into that.

It is also a lot faster. App owns to the camera. Tap to take a picture. You can add a caption or a doodle and send it to multiple people.

MMS doesn't even come close to that experience.