Twilio developers have been challenged to create mashups of Twilio and Twitter for the past two weeks, with impressive submissions. The Washington State Department of Transportation's Twitter direct message service won last week's contest, while this week's winners are Tim Lytle's Group Call and Mike Ivanov's Music Monday. Both applications offer unique features that utilize real-time web and cloud communications to enhance user experience. Group Call allows users to join group calls with others, while Music Monday provides a platform for discovering new music by listening to songs played on Twitter. The Twilio developer contest continues to grow in popularity, with new categories announced every Monday and submissions due the following Sunday.