The idea behind Share Play, the most prominent feature of Sony's soon to arrive and feature-packed Firmware 2.0, is that it enables you to pass the controller to a friend as if you were sitting on the sofa together. Except the sofa is now the internet - if you're friends with someone, you can play multiplayer games with them, or even let them take control of your machine as if you'd physically handed them the pad. Anyone, anywhere. This is a platform specific feature too, so publishers will have to specifically opt out. Talking to Sony, even things like alphas and betas would require the feature to be turned off.