In The Impact Equation, Brogan and Smith show that 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. 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-media 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.