If you want to know, try Facebook Analytics (example here). Facebook Analytics is an easy ty use and free way, how to analyse Likes, Shares and Comments of your web pages.
If you have Facebook comments, Likes or buttons on your web pages, probably you want to get some statistics of it. Facebook offers Facebook insights, which can help a little, something you can find in comments tool. But I didnt find a simple and really useful tool for statistics similar to Gooogle Analytics. So I did one: Facebook Analytics.
gather.php. This script has to be run once a day and its task is to collect (gather) data from Facebook.
gather.phphas a list of URLs and for every single URL the number of Likes, Shares and Comments is found. This data are stored in database.
The second part is script
fa.php, which is a user interface to database
gather.php. Interface is in
Google Analytics style,
but much more simple (I don't have so many programmers as Google has ;)
And that's it! Here you can see and try example installation of Facebook Analytics.