Always have something to talk about in case your guest doesn’t show up. I’m not saying that your guest will intentionally bail on you, but keep in mind that they’re human. They could have an emergency situation and not be able to get in touch with you before the show. What I do is keep a list of the neat social media tools I’ve discovered and talk about them. You can do that with your show too. Find a few interesting websites related to your niche and talk about them with your audience. Be sure to contact the person that was supposed to be your guest to see how they are and try to reschedule.