How to use Facebook as a Focus group - Audience Insights and Target Audience lets you review how many people people are interested in a particular product or service in a particular location.

Facebook has a free tool that will give you the number of people in an area interested in a particular thing e.g. females who like yoga in Wollongong. If you are a council looking to provide a service or a small company starting up, this will help you evaluate in real time what is happening in your area.