The term backchannel refers to an online conversation taking place at the same time as people are talking live. Twitter is not the only backchannel being used at conferences, but it is the most common at the moment.

Ask the participants for their opinion, and display their tweets directly in your slides. With Poll Everywhere, you can invite people to tweet a short comment directly to your slide in real-time. You can also ask multiple choice questions and watch a graph evolve as people vote. This technology can be provided by Poll Everywhere. Click here to get more info.