Cross media marketing involves advertising a product through various media platforms to reach a target demographic. Short films often use viral marketing through creating personalized websites, posters, and social media to create buzz. The Fly is an example of an effective cross media campaign for a short film, with a consistent logo, font, and imagery used across its website and posters. Successful long-form films like The Dark Knight, Harry Potter, and Star Wars also employed cross media strategies through merchandise, collaborations, and branding to build loyal global fanbases.