Make Calls Via Your Twitter Handle with Socialistr App Kofi Bosque-Hamilton, a senior developer at Oxfam America, created an app called Socialistr that allows users to make calls from one Twitter handle to another. The app is built on a Ruby, Python, and PHP stack and uses the Twilio Voice API for making calls. Kofi aims to unite social media users in a more personal way by allowing them to use their own voices to interact with each other through Socialistr. He hopes that the app will eventually move beyond just Twitter handles to allow hashtag-to-hashtag calls, enabling users to connect with others who share similar interests or passions.