From another comment [0] in this thread: > Remember the time they kept the app open in the background on iOS devices by sending an empty audio buffer to the ph

From another comment [0] in this thread: > Remember the time they kept the app open in the background on iOS devices by sending an empty audio buffer to the phone for playback? > People started discovering that after iOS introduced the battery/power usage section in the Settings app. They couldn't do it 24/7, of course, but they could certainly take "samples" at regular intervals or in certain locations or something. From my own experience, it doesn't seem that Facebook has ever been worried about battery life or preserving it. [0]: https://news.ycombinator.com/item?id=15580748 https://news.ycombinator.com/item?id=15580748