My iPhone won't switch Facebook accounts? - 1

I'm using my sister's old iPhone 4 and she already had the Facebook app installed, so I just logged her out and signed myself in. There's no problem there, but the problem is that every time I try to play an app that you can sign in with Facebook, for example Candy Crush, It automatically logs in as her even if she's never played the game. I don't have to constantly switch accounts on Facebook, I'm always automatically logged in. Can someone please tell me how to get my Facebook profile to show up instead of my sister's?

Being forced to dance what should I do?

I have been a dancer since I was 3 years old and have enjoyed dancing until about 6 months ago. I have lost any desire or interest I had for dancing. I have a deficiency in vitamin D but my numbers have significantly improved in the past few weeks. My parents on the other hand believe I don't want to go to dance because of this health issue. But due to how my energy levels are up and I feel completely normal I disagree. I don't like going because I have lost interest. My parents and I have had many arguments over this usually ending in them screaming, throwing things, and hitting. They also make the excuse of how I shouldn't quit because of the health state I'm in and say things that don't make any sense such as: your vitamin levels will come up when you go to dance class/ rehearsal every day for your usual 4-6 hour schedule. I understand it might help because of the exercise my body needs but I can get that by any other form of exercise like walking/jogging daily…

Added (1). I have come to a case where I refuse to go or get ready/dressed for dance class and my parents threaten me in taking away all of my belongings and valuables. I became so desperate that I let them take my iphone if it meant I didn't have to go back.

Added (2). They blame me for things like a car accident (my mom ran a red light because she was yelling at me and not paying attention at the road.) Or when my mom smashed my phone on the wall and was mad because she cut her hand on the broken screen. They saw that it did not bother me and threatened to send me to a mental hospital for refusing to go to dance class.

What is the correlation between Slave wage labor and American capitalism?

Like chinese child sweat shops, chinese building iphones and tech for cent an hour, chocolate coming from africa slave like work

I'm new to english and terminology but can you explain capitalism and the correlation of these things. Someone was talking about it saying, I don't think capatlism is bad but America does bad things in the name of capatalism and somewhere in the discussion i heard slavery, wage labor etc.

Power bank turns off when charging iPhone?

Within a few seconds of plugging my iPhone in, the lights on the power bank turn off, and my iPhone stops charging.
Could this be a defective cord?
Or is it the power bank/ my iPhone?
Please help, it's making charging my phone almost impossible because it won't charge through an outlet. Only my power bank.

How to make walking on my treadmill more fun?

I try to use it an hour a day, but it's so boring. I would rather walk outside, but the weather has been snowy and cold. I listen to music on my iPhone, but all I can seem to pay attention to is the time on my treadmill screen. Does anybody have any suggestions?