That’s fair, and there has always been the backchannel (as we talked about in the show). But the backchannel is like it is precisely because it’s a back channel – that is: the presenter isn’t seeing it live and in real time. I certainly think it’s worthwhile trying to capture people’s attention while on stage, and if you have questions to ask of the audience, having a more convenient way to do so is a thoroughly good idea. But, as @jeremy said, I can ask people to put their hands up for that, no? (And that fits into the KAV theory of learning, too.) I shall try Zeetings out at a talk that I do, and I know @jonobacon has already done so and has done so more since the show was recorded – I’d be interested to hear how that went!