Your Facebook Campaign
Before you create a Facebook campaign for your business, you need to have a set of goals and an accompanying strategy of how to achieve them.
After you have implemented your strategy, you will need a system in place to measure how effectively you are reaching those goals.
There are two major analytics tools you can use: Facebook Insights and Google Analytics.
Facebook Insights: metrics on how your followers are using your fan page. With Insights, you can see how many new and active users you have in a time frame,how often your content is shared, and information on the demographics of your users.
Google Analytics: Google Analytics doesn’t provide the same amount of demographical information about your users. However, it does provide a much broader range of dimensions for user.
Read more details on measuring your Facebook campaign ROI at business2community.