Use Poll Everywhere to collect responses and allow live class participation.
Go to http://www.polleverywhere.com to set up your poll, which is free for up to 25 responses.
Create a question, for free, to ask the group and define how the class will respond. Using the unique code for the poll, learners can respond via a specific website, text or tweet. Once activated, responses appear live on the screen and can be displayed in a number of ways. Polleverywhere also has a plug in for Powerpoint to display your results live, once set up.
(Image captured from Polleverywhere.com)