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Storage - Modify or delete the contents of your USB storage
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Yes. Any application that needs to save any data whatsoever (like last time logged in and posts read) needs that permission.
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Affects Battery - Control vibration, prevent phone form sleeping
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Any app is going to affect the battery. It only keeps the phone from sleeping if the app is open and active.
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Wants to run at start up . I don't want it to do that.
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It's actually a child process that runs in the background and checks periodically for private messages. The main app only opens when you ask it to.