On Android the first thing you notice when you install a firewall such as NetGuard is the amount of applications that try to access facebook servers. It's mind boggling, probably 50% are doing so. And I'm not even on facebook at all.
And it was sad to see in facebook offline activity how much data was linked to me, from apps which have the sdk. And you don't even need to log in via facebook or like/share. The sdk being present and working is enough.
Netguard proved to me that, despite never having a FB account, I surely had dozens upon dozens of shadow accounts. Pretty much any new hardware that had vanilla Play Store apps were ratting me out the entire time.
