The FACEBOOK app on iPhones was recently reported to have been draining the life out of people's batteries, even when it wasn’t running in the background and even with iOS 9’s new attention to saving your battery life, Facebook was still draining iPhones everywhere.
Facebook, addressed the problem in a post from their engineering manager. The developer, Ari Grant, wrote that Facebook “found a few key issues and have identified additional improvements.”
Grant revealed that part of the problem was the CPU spin in the app’s network code, stating that “A CPU spin is like a child in a car asking, ‘Are we there yet? Are we there yet? Are we there yet?’ with the question not resulting in any progress to reaching the destination.”
Another issue was