|Each day one winner is chosen and their message is broadcast to everyone. The fact that this statement is false both hurts and helps your idea. First, and most obviously, "everyone" is in fact "the other users of the app", not actually everyone. Even with record setting numbers of users, that's going to be a small fraction of everyone. Getting my message out to the users of your app is quite a bit less exciting than getting a message in front of everyone. On the other hand, the fact is that I don't care what most people have to say. If you really did pick a random person from the entire planet each day, I would probably stop reading in very short order because the overwhelming majority of daily messages would be utterly uninteresting to me. If users of your app were consistently more insightful than average, you might be able to keep me interested. Unfortunately, that's rather counter to your premise.