Originally Posted by Thom Little
Facebook uses Social Location
running in the background to determine where you are located. Social Location
uses GPS and is known to be a VERY heavy battery consumer.
You can turn this off in Facebook ...
Go to Menu
| Messenger location services
and un-check Location is on
Thanks to gjlamb
for this tip.
I believe that this is in reference to the official Facebook Android app in the Play Store, rather than the Facebook syncing account in settings->accounts.
I will say that I turned off this setting, but it doesn't prevent Facebook from getting location when the app is brought to the foreground. Whenever you start the app, you will definitely see the location status icon flashing in the status bar at the top of the phone, and there does not seem to be a way to turn this off. I wish that there was.