Might be worth shutting down those Facebook apps when you're not using them if true.Have you noticed an unusual battery drain on your iPhone or iPad lately? German iOS developer Sebastian Düvel has, and he decided to get to the bottom of it. He used Apple's Instruments OS X app, which allows developers to analyze and test iOS code, and found that Facebook's apps were the root of his battery drain problem.
In short, Düvel discovered that Facebook's apps are not shutting off like they should when they are in the background and not in use. Düvel found that the main Facebook app would become active for about 10 seconds and then go back into a sleep mode before becoming active for another 10 seconds again -- this happens continuously, all day long. The same thing happens with Facebook's Messenger app.