TweetToCall is a simple web service that allows users to initiate calls with their Twitter contacts using just one click. The service uses Twilio for power the telephone calls and requires authentication with a Twitter account, verification of phone numbers, and clicking on a "call" button next to friends who are also using the service. TweetToCall aims to provide an easy way to screen people without giving out personal contact information, while also being mindful of privacy and security features such as anonymous calls and limited 4-minute free calls. The service was built in just five days by a husband-and-wife team who wanted to create a proof-of-concept after being inspired by the idea of using Twitter for telephony. With its optimized interface for iPhone users, TweetToCall is now available at http://www.tweettocall.com and is open to expansion with features such as link generation and co-founder opportunities for the startup's owner.