If you’re having trouble keeping your iPhone charged, Facebook may be at fault. A German developer has discovered that the Facebook app’s misuse of background tasks is causing the app to run in the background all day, hogging the CPU and causing the battery to drain faster than normal. Until the bug is resolved, Facebook users can preserve battery life either by killing the app from the multitasking switcher after every use or by deleting the app and using the Facebook Web app within Safari. follow link
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Facebook for iOS Killing Battery Life