We need a web application where users can login through their Twitter accounts and then "poke" any of their followers who also use the same application, and reply to any incoming poke, in the same way as Facebook pokes work. In the application, you also see your incoming pokes. The look and feel should be similar to Facebook's poke feature. We also need an application for Android which allows users to do the same, and also allows them to receive push notifications whenever somebody pokes them. The Android app may not use a third party's services for the push notifications; they must be handled on our servers.