I have background app refresh off and I've seen Facebook, tweetbot and other apps have high background use now on iOS 9. Hell, Facebook always has more background use than it does on screen use. Again, background refresh for me is off. Why is it doing all this background work???
im glad im not alone, Facebook is constantly running with Background App Refresh off, it single handily killed my iPad in one day when I closed it with it off, so I constantly have to close it to make sure it doesn't constantly run, its definitely an issue with app, i think