Facebook page owners who want to know how many subscribers they have following their posts without Liking the page can see a list through a little known feature on Timeline.
From the “admin panel” at the top of a page, page owners can see who has recently Liked their page. Clicking “see all” brings up a window that allows admins to also see their subscribers. This is also accessible from the “See Likes” link on the Likes section of page insights. Page owners can tally their subscribers and click on profiles to see more information about who’s following them.
Read more details on this story at InsideFacebook.