Facebook chief executive Mark Zuckerberg stated that congress should consider forcing digital platforms to earn the legal immunity they enjoy hosting third party content, a legal change that could affect a range of online businesses. In written testimony submitted ahead of a House committee hearing on Thursday, Mr. Zuckerberg suggested changes to Section 230, the law that states that platforms such as Facebook generally aren’t responsible for what their users post.“Instead of being granted immunity, platforms should be required to demonstrate that they have systems in place for identifying unlawful content and removing it, “he stated.The comments were the most detailed yet from Mr. Zuckerberg on the issue. He had previously signaled openness to changing Section 230 in more general terms.