This document discusses building a mobile social voting app called "Hot or Not" using the SharePoint REST API. It begins with an overview of mobile social apps and the demo app. It then summarizes how the app is built as a SharePoint-hosted app using JavaScript, the REST API, and remote event receivers. The document demonstrates basic REST operations and discusses various REST endpoints. It also covers using the REST API in JavaScript and issues like the form digest. Finally, it discusses using remote event receivers for push notifications and the Windows Phone 8 client SDK.