As a test 2 scenes from the novel, 'Dancers in the Dark,' were shot for a $100, and then uploaded to YouTube. This was the only promotion for the novel, however, the video received thousands of 'hits' and pushed the novel to Number 1 Bestseller on Amazon's Dance category.
Getting a buzz about a film on Facebook, Twitter, Youtube, etc. is all free promotion, and not possible even a few years ago.
DANCERS IN THE DARK #1 Bestseller on Amazon Top 100 books in Music and Dance.