Perhaps nothing is as effective and efficient in spreading your message as a viral marketing campaign. The idea behind viral marketing is to inspire people to spread your message for you. It’s been estimated that a successful viral campaign can have 500-1000 times more impact than a non-viral campaign. Crafting a successful viral marketing campaign is more difficult than it looks. It requires careful planning and research. Use this cheat sheet to get started. Special thanks to @baekdal, @SEOmoz, and @isaiahmustafa.