Extremely important core system app Whatever you do  please DON'T DEACTIVATE IT! Don't disable it  and don't clear its cache! It isn't draining your battery. Facebook app is. Messenger app is. Keeping Location Services on is. This app is required for the smooth running of your Android device  even if you've disabled most of the in-built Google apps. Almost ALL app processes and services are dependent on it in some way. Yes  it uses up around 260mb of internal storage  but its indispensable functions justifies that.
December 29 2016