Viral marketing is a strategic approach used by film production companies to enhance film promotion through social media, word of mouth, and interactive content. Successful examples include 'Cloverfield' and '2012', which effectively engaged audiences and generated significant revenue through interactive websites and teaser campaigns. However, not all attempts, such as those for 'The Da Vinci Code' and 'Snakes on a Plane', met expectations due to ambitious goals or excessive audience involvement.