I was just checking my battery usage on settings and found that Facebook is doing some background activity, with 49 minutes of activity shown, problem is.... I have Facebook off on the background app refresh settings, so beaware in case you have battery issues.
Also, I found this, so I'm not alone after all.
Even with Background App Refresh Off, Facebook's Killing Your iPhone's Battery
Also, I found this, so I'm not alone after all.
Even with Background App Refresh Off, Facebook's Killing Your iPhone's Battery