Twitter? Maybe. iCloud? Not a chance. A proprietary service that you can only access on a limited number of proprietary pieces of hardware (with absolutely zero

Twitter? Maybe. iCloud? Not a chance. A proprietary service that you can only access on a limited number of proprietary pieces of hardware (with absolutely zero transparency) is never going to reach a large mass of users, never-mind if you attempted to shoe-horn a proprietary social network on top of it.