Why is Facebook Reach different in Databox?
Within Facebook, Page Reach is defined as "The number of people who saw any of your Page posts". This means that if the same user views your posts multiple times, they'll only be counted one time.
Within Databox, we receive a daily value for Page Reach which is then aggregated to determine the total for a given Date Range. As a result, if the same user sees a post on different days within that Date Range, they'll count towards the data multiple times. For example, if User 1 sees a post on October 1st and then again on October 4th, they'll count towards the data two times, in the daily value for October 1st and October 4th.