To make people truly care about what you have to say, you need more than just a good idea, trust among your audience, or a certain number of followers. You need a potent mix of all of the above - and more. As traditional channels for marketing and selling disappear and more people interact mainly online, the very nature of attention is changing. Use the Impact Equation to figure out what you're doing right and wrong. Apply it to a blog, a tweet, a video, or a mainstream advertising campaign. Use it to explain why a feature in a national newspaper that reaches millions might have less impact than a blog post that reaches a thousand passionate subscribers.