This didn't last long in my plugin list!

It’s not really free, as it’s tied in with a sign-up at linksalpha, a page with a really bad user interface, and later you’re told that the stats are only a 30-day free trial, after which you have to buy a subscription.

It also has very invasive privacy settings when you link to your personal Facebook account (eg it wants access to all posts and links of pages you manage! I manage several clients’ pages, so that’s a no no.). But you cannot link it to the relevant Facebook Page of the social sharing account.

Hence this plugin lasted all but 5 minutes!