With their power to shape public discourse under unprecedented scrutiny, social media platforms have revamped their speech control practices in recent years by building complex systems of content moderation. The contours of this tectonic shift are relatively clear. Yet, little work has systematically documented, examined, and theorized this process. This article uses digital methods and web history to trace the evolution of objectionable content on Twitter content moderation policies and practices between 2006 and 2022. Its conclusions suggest that, more than abandoning an Americanized view of freedom of speech, Twitter has aimed at building a crisis-resistant speech architecture that can withstand external shocks, criticisms, and shifting speech norms. This kind of modulated moderation, as we term it, hinges on a form of normative plasticity, whose goal is not necessarily adjudicating content as more or less acceptable, but moderating it on the basis of evolving and ever contingent public conceptions of objectionability.

中文翻译：

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调节审核：Twitter 审核实践中令人反感的历史

社交媒体平台拥有在前所未有的审查下塑造公共话语的能力，近年来通过建立复杂的内容审核系统来改进其言论控制实践。这次构造转变的轮廓是比较清晰的。然而，很少有工作系统地记录、检查和理论化这一过程。本文使用数字方法和网络历史来追踪 2006 年至 2022 年间 Twitter 内容审核政策和实践中令人反感内容的演变。其结论表明，Twitter 不仅放弃了美国化的言论自由观，还旨在制造一场危机抗性语音架构，可以承受外部冲击、批评和不断变化的语音规范。正如我们所说，这种经过调节的节制取决于某种形式的规范可塑性，