Are you implying this isn't a real app that will be available soon? I like to think I'm pretty good at "getting" hoaxes, and I'd definitely guess that this is "a real thing". (Though I wouldn't be shocked if it weren't...)
Edit: OK it looks like consensus is that this is satire. I still think it's kind of a neat idea, I admit it…
"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."
It is a real app, I've used it. It was created at a recent hackathon called TartanHacks at Carnegie Mellon University. That doesn't change the fact that its satire, though!
Edit: OK it looks like consensus is that this is satire. I still think it's kind of a neat idea, I admit it…