Different Film Marketing Methods And What They Are Suitable For

The Marketing methods i can remember from today are Viral, books, film websites, posters, merchandise, trailers, toys, video games and documentaries.
Today i learned that some film marketing methods are suited to particular audiences. For example: Creating a IPhone app for a Film is best suited to a film whose audience is 12+ because that age group would have phones and will be interested in that.Also creating a toy for a film is best suited for a film whose audience is a young age up to 12 because the children will enjoy the toy and therefore enjoy the movie because the toy in there hands is on the big screen.
Today i learned that some film marketing methods are suited to a particular genre of film. For Example: Having a book for a film is best suited to a film which is from the romance genre because they can compare the difference between the book and the film to see what is better.
Having a Trailer for a film is the best suited to a film which is from the horror genre because if it is first person it feels like you are actually the character.