The best tip here is to get rid of the Facebook iPhone app.1 I struggle with this one all the time.
Also, this one about regularly quitting apps – which people STILL do in 2014.
By closing the app, you take the app out of the phone’s RAM . While you think this may be what you want to do, it’s not. When you open that same app again the next time you need it, your device has to load it back into memory all over again. All of that loading and unloading puts more stress on your device than just leaving it alone. Plus, iOS closes apps automatically as it needs more memory, so you’re doing something your device is already doing for you. You are meant to be the user of your device, not the janitor.
Ok – he says to disable background updates for the Facebook app. ↩