Share 'Promoting on Facebook'

I'm curious about your experience when it comes to promoting on Facebook. When our book first came out in November, I promoted our book at different times of day, week, and using a variety of walls. I even went so far as to buy an ad (which brought a lot of people to the page, I will admit, but none of which were interested in our novel...go figure.) For the New Hampshire area, I've found that pr…