Android phones, apps and tablets

I listened to something on the radio the other day on which is was said that the FB app requests updates on the phone (not pushing updates to the phone) 5 times a second. Perhaps this has changed since they did the research... Perhaps not.

FB has been killing my battery too... They have a low-memory, low-data app called Facebook Lite that is only available in countries like India, Brasil etc. I got the APK and have been using it for a few weeks, it works well (not as slick but really light). Another advantage is that it has Messenger baked in so got rid of that one too.
http://www.apkmirror.com/apk/facebook-2/lite/