Hi LV246,
Firstable, we listen by ear not eyes. Second, at the conference, the speaker share with you his opinions about some topic, and do you think all his opinions are absolute right? I don't think so, at least some of them need a little bit of adjustment. And i believe that some one of the viewer may have may have better opinion than the speaker, not the whole topic, just some idea better. And ThienY will be there to raise it up. It's not only the question, but also comment, idea, even objection....You can actually participate to build the topic.
So, i think people should change their mindset, don't 100% concentrate to the speaker's thoughts. May be you give 80% to the speaker and 20% to the thought of the crowd, where i think the Top Thought come in. If you see the thought that you like, just thumb up and let the rest for ThienY's algorithm.