Viral marketing refers to techniques that use social networks to spread awareness of a brand through self-replicating viral processes like the spread of viruses. It works through word-of-mouth, with people on average telling three others about a liked product and eleven others about a disliked one. Viral ads aim to create messages that snowball in a positive way. Examples include interactive games, videos, and images distributed through platforms like YouTube, Facebook, and Myspace to advertise products and services inexpensively to a wide audience.