You might not know what Section 230 of the 1996 Communications Decency Act says, but it affects your life every day. This short passage of the law says online platforms are not legally liable for what people say or do in the spaces they run. Trillions of dollars in company valuation and the sharing of content as we know it rests on the rule. But in the era of deep fakes, election meddling and radicalization by algorithm, is it time to revisit Section 230? If you got rid of it, what kind of rules would replace it? And what platforms would even be left? We asked Jeff Kosseff, a professor of cybersecurity law at the U.S. Naval Academy and the author of “The 26 Words that Created the Internet.”