If for no other reason than the Facebook app is a memory/battery hog, do yourself a favor and uninstall it, you'll feel better
Why your smartphone battery hates Twitter and Facebook
To paraphrase the saying about paranoia: just because you’re obsessed with battery life doesn’t mean that data-hungry apps aren’t out to drain you. In my case, I decided to put my foot down on the issue of having to charge my phone at 2 p.m. every, single, day. I looked into the services running on my Android phone (a Galaxy Nexus), and noticed that those using up the most memory, and probably demanding a data connection most often, were Facebo…
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I'm proud to say I've never had it on my devices.