I clearly misunderstood what is meant by "Would it be considered impossible to obtain permission from the original source?" as criteria for fair use.[0] I've se

I clearly misunderstood what is meant by "Would it be considered impossible to obtain permission from the original source?" as criteria for fair use.[0] I've seen numerous images on Wikipedia that use this as reason for fair use. Someone uploads an image to 4chan as anonymous, for example, without a path to ask permission it might be fair use to use that image.This is different from someone posting an image to facebook where there is a way to ask the author for permission. Please, explain my misunderstanding here. [0]: https://i.kinja-img.com/gawker-media/image/upload/qxptplnxqtrhme965gal.jpg https://i.kinja-img.com/gawker-media/image/upload/qxptplnxqt...