Technically, it may be trespassing to step on someone else's yard. But if your shoe brushes up against their lawn while you're walking on the sidewalk out front of their house, it's not trespassing. Or if it is trespassing, it's a *di minimis* trespass, too small to matter to the law. A *lot* of potential copyright violations - like taking a picture of a passage in a book and posting it to social media - are so small that we don't need to apply a fair use analysis to them.

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