This is a useful idea, but only if you’re fortunate to have the necessary funds to do advertisements on the internet. One place to go is FaceBook. Although they might be somewhat overpriced, they can be wonderfully aimed towards a specific age group or gender, they can be geographically target [like the main location for your book. such as the South], they can be targeted for individuals who share a particular interest such as liking to read Paranormal romances, etc.