I believe you are looking at "Increasing conversions". The usage of facebook API conversions is good thing to start with. However you can engage your customers by sharing on content view, addtocart and checkout page not just with facebook but also twitter and whatsapp too.
checkout the app at https://apps.shopify.com/customer-account-dashboard and demo at demo store you can add Facebook API app id details in app settings to conversations.
You can even view conversations stats in app dashboard