Blink, which is available in both Chinese and English (although the English can be a bit rough at times) works like this: the camera comes on as soon as the app is opened. Thumbnail images of all the user’s friends line the right side. Click one of them to snap a photo or hold to take a 16-second video, then add some MS Paint-style graffiti, text, and an audio message. When the recipients get it, they can add on to the photo with their own embellishments and send it back. The photos and videos disappear after they’re swiped away, but screenshots are allowed and senders can choose to save the original image to their phone. There’s no history of any chat dialog.