Facebook CEO Mark Zuckerberg will tell lawmakers his plan for “thoughtful reform” of a key tech liability shield rests on requiring best practices for treating illegal content online. From a report: Tech giants are starting to embrace changes to the foundational law that shields platforms from liability from content users post as lawmakers from both parties threaten it. In written testimony ahead of the House hearing Thursday with Google, Twitter and Facebook CEOs, Zuckerberg suggested making Section 230 protections for certain types of unlawful content conditional on platforms’ ability to meet best practices to fight the spread of the content. “Instead of being granted immunity, platforms should be required to demonstrate that they have systems in place for identifying unlawful content and removing it,” Zuckerberg wrote in the testimony. “Platforms should not be held liable if a particular piece of content evades its detection — that would be impractical for platforms with billions of posts per day — but they should be required to have adequate systems in place to address unlawful content.” The detection system would be proportionate to platform size, with practices defined by a third party. The best practices would not include “unrelated issues” like encryption or privacy changes, he notes. He also suggested Congress bring more transparency and oversight on how companies make and enforce rules about content that is harmful but still legal.