Week 5

Post reach is the number of people who saw specific posts on your business page or on their feed. Post engagement is the number of times people have engaged with your content in general; things like likes, comments, and shares count as engagement. The difference between the two is stark: Reach is simply a number of eyes on your content while engagement determines what content was strong enough to compel people to interact with it. 

Businesses can use Facebook Insights to better serve their customers by using it to determine what content is working for your page and when to post in order to reach more people; it allows a business owner to understand their page's performance. 

Note: I added comments to these three pages.