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My friend would borrow my phone all the time to watch Youtube. I didn't think this was a problem but the app seems to recognize her account as the default or something. I can log on mine, but every two weeks it automatically logs into hers and when I log out a list pops up: I can "add" an account or select hers. But I can't find a way to edit this list so that it only shows mine. My friend claims she never did anything.
I will never let anyone borrow my phone without supervision ever again.