The talk starts with explaining Secure Multi-Party Computation (MPC). Then we explain the rise of cloud storage, cloud computing and social networks. We regard it as a consequence of a failure in the design of adequate OS (operating systems). We survey some of the solutions proposed to address security problems on the cloud. This presentation is focused on analyzing whether MPC is the correct technique for this problem. Moreover, besides issues as speed, we show that other problems pop up that are irrelevant in a typical MPC setting.