From version 7.13.20, you can track shares for every social share network you have integrated at your website by using the add-on Social Shares Tracker. Facebook had recently stopped serving shares via their graph API which Super Socializer used to show Facebook shares and this change has vanished the Facebook shares being displayed with the Facebook share icon at the websites that are using this plugin. Solution to track Facebook shares again is to use the add-on Social Shares Tracker as mentioned above.