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Amazon tells court it shouldn't have to police its platforms for hate speech and disinformation
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Graffiti is not a great analogy because it's not what your property is made for. If you had a wall on your property that you made publicly accessible specifically for graffiti, then you may be responsible for what you allow to stay up on it. Otherwise, it's just someone vandalising your property.