The document discusses viral marketing campaigns used by movie studios to promote upcoming films through social networking sites. It provides examples of successful viral campaigns for The Dark Knight and The Blair Witch Project that helped generate hype and positive word of mouth leading to commercial success. The Dark Knight campaign featured a fictional election for a character and emails from a fake election website that was later defaced to build anticipation for the Joker character. The Blair Witch Project is credited with starting the trend of using viral marketing techniques online.