Since your students all play with their cell phones in class why not allow them to be engaged in the conversation with a live poll.
Its as simple as asking your youth a question, have them answer using sms text message, twitter or the web. You can then see and show your real time results in powerpoint or browser. Thanks to a great service called Poll Everywhere.
Oh yea – it can be FREE if have less than 30 participants in the poll beyond that there are small monthly charges for larger groups.