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But it is proper etiquette to inform the viewer that it is not your original work. You can add context to it, if you agree or disagree. If you see a lot of people doing something you think is wrong and disagree with, that is not an invitation to join them.

You are right. My first day here I got into a rally of posting whatever and wasn't thinking about ethics, all I had in my mind was $$$$$$$$$$$$$$$. Luckily I quickly saw what was happening and made a 180 degree change in my approach. That is why I am being so thoughtful about all this now.