CallMyWall is a simple Facebook app that allows users to call in their status with the click of a button. It was built by John O'Brien using PHP and MySQL, and leverages Twilio's APIs to enable voice calls. The development process took approximately 5 hours, from initial idea to production-ready application. O'Brien discovered Twilio through a tweet from Dave McClure, who recommended the platform for building communications applications. With CallMyWall, users can call in their Facebook status, record a message, and have it published on their newsfeed with a link to the voice status. The app is designed to be easy to use and requires only a phone number and permission to post to the user's newsfeed to function. O'Brien expresses enthusiasm for Twilio and its potential applications, but notes that he is still exploring ideas for what else can be built with the platform.