So back to Facebook. I figure it was worth taking a look at Facebook Advertising, I set up a marketing campaign to promote the facebook page for our app in the sidebar with a maximum spend of $5 per day and let it run for three days (total cost $15.46), It generated 64 likes but we got no more than one or two sales over that period. Why somebody would like our app page if they did not intend to buy the app i'm not sure. In summary, won't be doing that again!
One more thing... came across a few hits from this website http://semiprocycling.com/basics which provided a little review of our app 28 minutes in, pretty cool to hear someone talking about it instead of just reading.