One big issue with this model is that you can't build an audience. You can't make friends. What's the point of using the site when all of your posts go to the void. Even if you add a friend all of those posts you worked hard on are gone. If it takes a long time before there is new content to see, why would people visit the site instead of forgetting about it? How are you going to make it a rabbit for people to go the…
I view this as a great way to keep in touch with people you actually know.