I'm connected to 100 FB pages.
How can I see the number of FB posts posted on each page for a given time period (example Sunday-Monday)?
Bonus points for seeing who the author of the post is (the number of posts by an author).
are you looking for posts by page admins or by page visitors?
Posts created by page admins have numerous different metrics that you can choose from (Facebook Insights connector) and you can filter the queries by a certain date range (or by filtering for example only Mondays posts). Page visitors posts have much less details available (Facebook Public Data - Simple connector) and you cannot choose only certain time period, except by filtering.