At Reactions, we offer you no way to save your pictures. If you want to save them, you have to share them. After a reaction is captured, you have 3 seconds to hit the unlabeled cancel button, or else your photo is automatically shared with all your Facebook friends.
As the name suggests, Reactions captures your reaction with the front-facing camera, and the scene, with the back camera. It’ll be fun if we can swap between the larger and smaller frame, so that our face is the main attraction.