Add a social discussion in your class! SpeakUp allows you to create a chat room, which can be anonymous. Once inside, users can interact in it by writing and rating messages. It is also possible to create multiple-choice questions to poll the audience. Futher information can be found on http://speakup.info

You can also learn more about how to configure the app, by visiting the Support Page's section on How to set up Apps, or using this direct link.