Thanks for answer. So were is the line drawn? Is a book shop liable for the content of the news papers they choose sell? Am I liable for a visible, slanderous

Thanks for answer. So were is the line drawn? Is a book shop liable for the content of the news papers they choose sell? Am I liable for a visible, slanderous headline from newspaper I carry on subway? If network chooses to prioritize traffic (i.e. anti-net-neutrality) are they then liable for content of that traffic?