Page Reach is the number of unique individuals who visited at least one piece of content you published on Facebook or liked. It is a metric that measures the visibility of your content on Facebook. Page Reach is calculated by adding the number of unique people who have seen any content on your Page (posts, photo tags, check-ins, etc.) and then subtracting duplicate views. The reach for any given post will be lower than the total reach for your Page because not everyone who sees your Page will see every post. Page reach includes people who saw your content as a result of paid promotion, organic distribution, or a combination of both.