Three secrets for making a message go viral

“Making an idea contagious isn’t a mysterious marketing art,” write Dan and Chip Heath for Fast Company. “It boils down to a couple of simple rules.” Here’s one secret: share information that at least seems like a public service—for instance, Denny’s is giving away free breakfasts. It’s like you’re doing the person a favor, and they will want to pass that favor on to others.