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All Page admins will now be able to see impressions for each of their posts. They'll also see the feedback rate, or what percentage of time fans "like" or interact with their posts.
Facebook is also making some changes to how monthly active users or MAUs are counted. Instead of users that actively "like" or comment on content, all unique users that see posts will get counted into a Page's MAUs, which will drive overall numbers up.
In the past, this kind of data was only for Pages with over 10,000 fans. It's a good gesture from FB - is anyone here using it yet?