The number of people (unique users) sharing "stories" about the brand page over the last 7 days. Includes: like the page, post on the page wall, like a post, comment on a post, share a post, answer a question, RSVP to a page's event, mention the page in a post, tag the page in a photo, check in at a place, share a check-in deal, like a check-in deal, write a recommendation