On the Facebook "Admin Panel" there is a section "Insights" which states:
Once 30 people like your Page, you'll get access to insights about your activity.
What does this provide?
Web Applications Stack Exchange is a question and answer site for power users of web applications. It only takes a minute to sign up.
Sign up to join this communityIt provides some statistical information about the Like
in your page, such as total likes, trends etc About Page Insights.