I always have background app refresh turned off on my iPhone 5 (iOS 9.0.2) for all apps. Yet when I check the handy new battery usage feature in iOS 9, the Facebook app shows up in the list along with the other apps I've been using. However, it also says "background activity" with the FB app. What's going on? Not sure what to believe. iOS settings says refresh is OFF (for all apps), while elsewhere it appears to be saying background activity is still happening on the FB app. Is there a difference between "background app refresh" and "background activity"? I already know the FB-is-evil-and-their-POS-app-sucks routine. I'm just wondering what's going on as I'm sure FB isn't the only app that does this.