Marketing techniques that rely upon social networks (both on and off-line) to spread their message rapidly. The “viral” metaphor refers to the way the message is spread from an “infected” user to other users similar to the way an actual virus or computer virus spreads. This is in contrast to traditional marketing techniques that broadcast a message to a wide audience simultaneously. Online viral campaigns typically rely upon creating content that people will want to share in the form of links, images, videos, etc.